BSM


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents


us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:StatementClassOfStock
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AwardType, us-gaap:IncomeStatementLocation
us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Revenues

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities
bsm:AssetAcquisition, us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities
bsm:AssetAcquisition, us-gaap:StatementGeographical, us-gaap:SubsequentEventType
bsm:AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable
us-gaap:CounterpartyName, us-gaap:Range, us-gaap:StatementGeographical, us-gaap:PlanName
bsm:AssetAcquisitionOwnershipInterestInWellsOperatedByOthersGrossPercent
bsm:AssetAcquisition, us-gaap:StatementGeographical, us-gaap:SubsequentEventType
bsm:AssetAcquisitionPriceOfAcquisitionExpected
us-gaap:BalanceSheetLocation, us-gaap:PlanName
bsm:BusinessCombinationProFormaInformationWorkingInterestsInWellsDrilledAndCompletedActual
us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:BalanceSheetLocation, us-gaap:PlanName

bsm:ChargesOnPartnersEquityForAccruedDistributionEquivalentRights
us-gaap:LimitedPartnersCapitalAccountByClass

bsm:DistributablePreferredStockDividends
us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:PlanName, us-gaap:SubsequentEventType
bsm:ExploratoryWellsExpectedToBeDrilled
us-gaap:IncomeStatementLocation
bsm:IncentiveCompensationCash
us-gaap:IncomeStatementLocation
bsm:IncentiveCompensationExpense
us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:IncomeStatementLocation
us-gaap:BusinessAcquisition
bsm:NetWorkingCapitalCostIncurredForAcquisitionOfProvedAndUnprovedOilAndGasProperties
us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:PlanName
bsm:PartitionAgreementOwnershipInterestInPartitionedDrillingUnitsPercent
us-gaap:LimitedPartnersCapitalAccountByClass
bsm:PartnersCapitalAccountRestrictedCommonUnitsGranted

bsm:PaymentsForProceedsFromDerivativeInstruments
us-gaap:Energy, us-gaap:HedgingDesignation

bsm:ProceedsFromFarmOutOfOilAndGasProperties

us-gaap:AmortizationOfDeferredCharges

us-gaap:AssetRetirementObligationAccretionExpense
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationAcquisitionRelatedCosts
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
us-gaap:CounterpartyName, us-gaap:PlanName
us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:PlanName

us-gaap:CapitalizedExploratoryWellCostChargedToExpense1
us-gaap:BusinessAcquisition
us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
us-gaap:BusinessAcquisition
us-gaap:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
bsm:Period, us-gaap:Energy, us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure
bsm:Period, us-gaap:Energy, us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:DistributionMadeToLimitedPartnerCashDistributionsPaid
us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:StatementClassOfStock
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:DistributionMadeToLimitedPartnerDistributionsPaidPerUnit

us-gaap:ExplorationExpense

us-gaap:GainLossOnDerivativeInstrumentsNetPretax
us-gaap:Energy, us-gaap:HedgingDesignation

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:ImpairmentOfOilAndGasProperties
us-gaap:FairValueByMeasurementFrequency

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAssetRetirementObligations

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:InvestmentIncomeNet

us-gaap:LimitedPartnersCapitalAccountDistributionAmount
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:NetIncomeLossAllocatedToLimitedPartners
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:OperatingLeaseExpense

us-gaap:PartnersCapitalAccountTreasuryUnitsPurchases
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PartnersCapitalAccountUnitBasedCompensation
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:PartnersCapitalAccountUnitsTreasury

us-gaap:PaymentsForLeasingCosts
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:PaymentsForRepurchaseOfEquity
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireFurnitureAndFixtures

us-gaap:PaymentsToAcquireOilAndGasProperty

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:PreferredStockDividendRatePercentage

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:ProceedsFromSaleOfPropertyHeldForSale
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:ProductionTaxExpense

us-gaap:RepaymentsOfLinesOfCredit
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:StockIssuedDuringPeriodSharesAcquisitions

us-gaap:StockIssuedDuringPeriodValueAcquisitions
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:HedgingDesignation
us-gaap:UnrealizedGainLossOnCommodityContracts

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstandingDiluted
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows

srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccruedBonusesCurrent

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet

us-gaap:CapitalizedCostsProvedProperties

us-gaap:CapitalizedCostsUnprovedProperties
us-gaap:CreditFacility
us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:CreditFacility
us-gaap:DebtWeightedAverageInterestRate
us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:DerivativeAssetFairValueGrossLiability
us-gaap:BalanceSheetLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssetsCurrent
us-gaap:HedgingDesignation
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
us-gaap:BalanceSheetLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:BalanceSheetLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:DerivativeLiabilityFairValueGrossAsset
us-gaap:BalanceSheetLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:DividendsPayableCurrentAndNoncurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity

us-gaap:LongTermLineOfCredit
us-gaap:CreditFacility
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:Ownership
us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment

us-gaap:OilAndGasPropertySuccessfulEffortMethodGross

us-gaap:OilAndGasPropertySuccessfulEffortMethodNet

us-gaap:OtherLongTermDebtNoncurrent
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:PartnersCapital
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:PartnersCapitalAccountUnits

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PrepaidExpenseAndOtherAssetsNoncurrent

us-gaap:PropertyPlantAndEquipmentOtherAccumulatedDepreciation

us-gaap:PropertyPlantAndEquipmentOtherNet
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:TemporaryEquityCarryingAmountAttributableToParent
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:LimitedPartnersCapitalAccountByClass
us-gaap:TemporaryEquitySharesOutstanding

Plots across concepts


IncomeStatement
Net Income Loss
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Property Plant And Equipment Net
Liabilities
Liabilities Current
Current Liabilities
Other Liabilities Current
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Gain Loss On Sale Of Property Plant Equipment
NonoperatingIncomeExpense
Nonoperating Income Expense

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:LimitedPartnersCapitalAccountByClass,us-gaap:StatementClassOfStock bsm:CommonUnits,us-gaap:SeriesBPreferredStock▄▄14.96914.969NA14.96914.96914.969NA14.9690.014.969NA14.96914.96915.063NANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
 TTM Greenblatt ROC _ _▄▄▅▅▄▆▅▆▆▄█▅▅▅▄▅▅▅▄▅▃▄▃▅▁▄▃17.02617.21331.68625.228-5.31480.50944.67975.233100.66614.594170.71766.1833.52447.9623.01326.21657.8465.015-3.97939.316-19.47811.61-49.52354.699-121.22420.193-17.587NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:IncomeStatementLocation bsm:RestrictedCommonAndSubordinatedUnits,us-gaap:GeneralAndAdministrativeExpenseNANANA1.1381.1261.285NA2.5522.5913.019NA3.4043.3713.405NA3.3642.941.808NA4.4873.192.743NA3.1362.6681.282NANANANA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:IncomeStatementLocation bsm:RestrictedCommonUnits,us-gaap:GeneralAndAdministrativeExpense█▁1.0370.949NANA1.1261.285NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:IncomeStatementLocation us-gaap:RestrictedStockUnitsRSU,us-gaap:GeneralAndAdministrativeExpense▁█1.6972.161NA0.2951.098-4.657NA0.7270.6375.62NA5.6115.1732.242NA3.7672.7232.353NA3.0665.4262.613NA2.071.26NANANANANA
us-gaap:GeneralAndAdministrativeExpense ▂▃▁▁▂▂▃▃▃▆▄▆▆▅█▄▅▄▆▄▅▄▇▅▅▃▄▄▃▄12.18712.85210.2459.38111.50111.85613.60314.18914.34721.21416.29622.08319.81218.52125.57617.30517.48117.21220.92616.67718.13417.40123.64518.99419.71814.81817.15815.64414.51215.451
us-gaap:InterestExpense ▂▁▂▂▄▆▇█████▇▆▆▆▆▅▄▃▂▁▁▁▂▄▄▅▅▅1.6281.211.3531.6642.9644.4274.8635.3955.6525.5255.4375.5185.284.5214.0344.1723.9813.5072.7742.2821.4431.0480.8880.871.7152.9453.2173.443.4193.433
us-gaap:InterestPaidNet ▁▁▁▂▄▆▇█████▇▆▅1.0030.9411.0781.4372.7614.1734.6165.2365.4215.1975.1545.2435.0384.3263.72NANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▁█15.42916.186NA23.733-8.37176.112NA70.24795.0879.017164.13860.77528.6941.957NANANANANANANANA-49.7353.442NANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▄▄▄▄▃▆▅▆▆▄█▅▄▅▄▄▅▅▄▅▃▄▂▅▁▄10.17910.93625.09518.483-13.62170.86234.76764.99789.8373.767158.86555.50323.48836.65516.77921.38853.51860.46-8.61436.219-22.1118.943-51.34650.916-107.58714.381NANANA66.005
us-gaap:NonoperatingIncomeExpense ▆▇▇▇▅▃▃▃▂▂▁▂▃▂▄▄▄▄▅▆▇▇█▇▇▅▅▅▅▅-1.597-1.027-1.341-1.495-3.057-4.397-4.662-4.986-5.579-5.577-6.579-5.405-4.834-6.003-3.653-4.182-3.666-3.432-3.307-1.781-1.332-0.861-0.207-0.807-1.542-2.894-3.126-3.375-2.68-3.341
us-gaap:OperatingExpenses ▂▂▂▁▂▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▆▄█▃█▃▂▂41.41644.35545.7418.51443.843102.54558.34962.13662.95269.21275.3373.53875.78566.53472.42962.89562.68459.56760.69159.85560.04752.771149.56382.321186.02770.868186.76471.51554.14654.187
us-gaap:OperatingIncomeLoss ▄▄▅▅▄▆▅▆▆▄█▅▅▅▄▅▅▅▄▅▃▄▃▅▁▄▃▅▅▆17.02617.21331.68625.228-5.31480.50944.67975.233100.66614.594170.71766.1833.52447.9623.01326.21657.8465.015-3.97939.316-19.47811.61-49.52354.699-121.22420.193-17.58761.2864.79173.225
us-gaap:OtherNonoperatingIncomeExpense ▇▇▇▇▆▇▇█▇▆▂▇█▁█▇█▇▅▇0.0310.1830.0120.168-0.096-0.0010.1790.3650.026-0.098-1.2020.060.409-1.5150.362-0.0010.2820.069-0.5380.041NANANANANANANANANANA
us-gaap:ProfitLoss ▄▄▅▅▄▆▅▆▆▄█▅▅▅▄▅▅▅▄▅▃▄▃▅▁▄▃▅▆▆15.42916.18630.34523.733-8.37176.11240.01770.24795.0879.017164.13860.77528.6941.95719.36222.03454.17461.583-7.28637.535-20.8110.749-49.7353.892-122.76617.299-20.71357.90562.11169.884
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▄▃▂▂▂▃▃▃▄▄█▅▄▄▃▃▃▃▂▃▁▂▃▄▂▃▅▄▄▄117.92289.4577.42664.82857.70393.043103.028113.079134.431124.989246.047158.232142.656130.82795.44298.45298.521101.85756.71299.17140.56964.381100.04137.0264.80391.061169.177132.795118.937127.412
us-gaap:Revenues ▂▂▂▁▁▆▃▄▅▃█▄▃▄▃▃▄▄▂▃▁▂▃▄▂▃▅▄▄▄58.44261.56877.42643.74238.529183.054103.028137.369163.61883.806246.047139.718109.309114.49495.44289.111120.524124.58256.71299.17140.56964.381100.04137.0264.80391.061169.177132.795118.937127.412
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:Assets ▃▃▃▃▅▆▆▆████▇▇▆▃▃▃▂▂▂▁▁▂▂▃▄▅▅▅1242.2471226.1491243.9781260.0161438.8381522.5671545.2081595.8131724.5551711.8871750.1241754.2591669.4641635.9781576.4511246.071250.0861199.7221128.8271137.2321126.831045.8431061.4361161.4461118.5691274.2911326.7821444.4671466.7691468.856
us-gaap:Liabilities ▃▂▂▂▄▅▆▆▇▇▇██▇▆▅▆▆▅▄▄▂▂▁▁▆▆218.193189.359185.011197.022364.796420.48448.404460.131580.54577.998547.5636.95598.832549.498485.908427.681452.199451.724403.166364.264349.552186.791150.783111.2593.929502.154512.4NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▃▃▃▃▅▆▆▆████▇▇▆▃▃▃▂▂▂▁▁▂▂▃▄1242.2471226.1491243.9781260.0161438.8381522.5671545.2081595.8131724.5551711.8871750.1241754.2591669.4641635.9781576.4511246.071250.0861199.7221128.8271137.2321126.831045.8431061.4361161.4461118.5691274.2911326.782NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:AssetsCurrent ▁▁▁▁█▅▃▄▄▃▅▃▃▃▂▂▂▂▂▂▂▃▃▂▁▃▄71.5464.78566.52161.921221.422159.777102.291121.334126.282113.129157.533117.128107.739100.62487.64383.79994.83690.178.98984.24278.9197.286103.59593.65770.42108.598134.904NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▂▁▂▁▂▄▁▂▂▃▂▃▃▃▄▄▆▅▃▅▃▆▃▃▄▇▄▆█1.0433.7891.7963.0571.63.048.1191.9663.9064.2475.4144.4417.0716.2975.6428.9117.48714.0059.7724.8489.775.01313.2335.576.0488.36814.8037.99212.78917.978
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁▄▂▃▂▃█▂▄▄▅▄▇1.0433.7891.7963.0571.63.048.1191.9663.9064.2475.4144.4417.071NA5.642NANANA9.772NANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▄▃▃▂▁▃▅▅▆▇██▇▆▅▄▄▄▄▃▂▁▁▂▂▂▄68.38159.28861.90848.49745.4858.46478.21484.84295.958103.327113.148111.48299.02892.85580.69568.89572.25574.97468.18164.39153.56844.3741.24652.34754.21550.79474.092NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▂▁▂▂▂▂▁▁▂▁▁▁▂▁▁▁▂▁▁▂▂▁▁▁▂█▇2.1161.3931.6681.7982.3291.9951.1681.4721.9771.5431.0011.2051.641.4721.2121.2691.7651.1211.0361.7182.161.0520.8561.4041.86310.5238.538NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:PropertyPlantAndEquipmentNet ▃▃▃▄▄▅▆▆██▇█▇▇▆▃▃▃▂▂▂▁▁▂▂▃▄1163.0661155.691172.1361192.3471211.1711355.1141434.2281457.0541582.4341586.3861575.8811630.6341554.9121527.3681481.331156.2711143.1911097.9631044.6711050.5881045.308938.053938.5941051.9271046.0991162.611189.346NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:AccountsPayableCurrent ▂▁▂▂▁▁▂▂▂▂▂▄▁▁▁▂▂▂▂▂▂▂▂▇█▇▇3.322.2193.4073.5372.870.5635.3094.5745.9116.6394.14914.5952.9522.2822.4643.6593.5333.9494.1424.8335.164.1275.03628.10835.33231.0829.415NANANA
us-gaap:AccruedLiabilitiesCurrent ▁▁▂▂▁▁▃▂▅▅██▇▅▇▅▅▅▇▅▅▆█▂▂▂▂9.9258.38215.56812.47610.3378.82322.70217.38439.10538.97760.08958.86852.57635.29252.63138.33639.54138.70450.95239.39436.47548.78958.00318.22715.23312.16516.252NANANA
us-gaap:LiabilitiesCurrent ▇▄▃▂▁▁▂▂▃▄▅█▇▄▄▃▃▃▅▃▃▄▅▃▅▇▇95.08456.78439.94721.29815.15210.79829.80323.01645.97348.50964.766114.72392.69755.21459.73442.29743.27747.59471.33144.36443.4752.91663.03946.33565.49795.96998.572NANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA2.078NANANA3.495NANANA5.213NANANA3.327NANANA9.104NANANA6.367NANANANANANANA
us-gaap:OtherLiabilitiesCurrent ██▇▇▇▅▇▂▁1.7921.7361.6541.6231.6341.4121.6331.0580.957NA0.528NANANA0.417NANANA0.0NANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▃▄▄▆▅▇▇█▆▇█▇▅▅▅▅▄▃▄▄▁▄69.89355.68660.39563.44586.51971.45106.41105.334110.80290.17495.659113.39399.85276.47470.18672.50275.2163.95455.09758.01557.63825.90667.57NANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▆▆█▆▆▆▆▆▅▆▅▅▅▁▆▅▅▆▅▄▅▆-12.54-0.2140.606150.273-1.0241.3910.21-2.82-21.634-24.379-20.079-52.466-31.093-60.166-337.767-18.115-34.281-64.086-17.782-30.882-137.796-35.08213.224NANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▃▁▃▃▃▃▃▃▃▃▃▄█▃▃▄▄▄▅▄▃-60.099-53.479-62.262-212.261-86.935-77.92-100.467-104.454-89.509-66.962-74.607-63.557-67.985-15.653264.312-52.963-47.4474.365-32.391-32.05584.9150.956-73.131NANANANANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁█-2.7461.993NA1.457-1.44-5.079NA-1.94NANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:DepreciationDepletionAndAmortization ▁▁▂▂▂▃▄▅▆▅▇▅▆▅▆▅▅▅▃▅▅▃▃▄▆▅▅█▄▃15.79615.63219.8219.82319.19323.18224.65127.37529.72527.83334.51829.27330.29228.5730.05129.20428.926.37922.83328.73129.20221.72120.88423.28832.23527.89127.90437.06523.85923.134
us-gaap:IncreaseDecreaseInAccountsReceivable ▇▅▇▆▃▂▄▃▄▃▅▇▆▇▆▄▅▆▆█▆▆▃▅▆▁▂▃▅█8.779-2.6213.353.7-13.851-19.693-6.59-11.242-7.472-9.741.54212.0746.06411.8515.375-3.609-2.256.5686.61516.5593.5463.039-11.101-2.6043.417-23.298-17.343-14.149-2.616.882
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▃▄▄▆▅▇▇█▆▇█▇▅▅▅▅▄▃▄▄▁▄69.89355.68660.39563.44586.51971.45106.41105.334110.80290.17495.659113.39399.85276.47470.18672.50275.2163.95455.09758.01557.63825.90667.57NANANANANANANA
us-gaap:NetIncomeLoss ▁█15.42916.186NA23.733-8.37176.112NA70.24795.0879.017164.13860.77528.6941.957NANANANANANANANA-49.7353.442NANANANANANA
us-gaap:ProfitLoss ▄▄▅▅▄▆▅▆▆▄█▅▅▅▄▅▅▅▄▅▃▄▃▅▁▄▃▅▆▆15.42916.18630.34523.733-8.37176.11240.01770.24795.0879.017164.13860.77528.6941.95719.36222.03454.17461.583-7.28637.535-20.8110.749-49.7353.892-122.76617.299-20.71357.90562.11169.884
us-gaap:ShareBasedCompensation ▃▃▃▂▃▁▃▃▃▅▄▅▅▄▆▄▄▃▅▄█▄▃▄▄▂▃▂▃▃3.0713.4622.3221.8252.474-2.8943.5783.8673.8169.2235.1879.5979.1246.22614.437.6756.2784.66110.0187.98119.2395.94.9485.696.1191.2433.8881.7982.1553.499
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▆▆█▆▆▆▆▆▅▆▅▅▅▁▆▅▅▆▅▄▅▆-12.54-0.2140.606150.273-1.0241.3910.21-2.82-21.634-24.379-20.079-52.466-31.093-60.166-337.767-18.115-34.281-64.086-17.782-30.882-137.796-35.08213.224NANANANANANANA
 us-gaap:PaymentsToAcquireProductiveAssets bsm:AssetAcquisition,us-gaap:StatementGeographical,us-gaap:SubsequentEventType bsm:MineralAndRoyaltyAcreage,bsm:NorthernMidlandBasin,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▃▁▃▃▃▃▃▃▃▃▃▄█▃▃▄▄▄▅▄▃-60.099-53.479-62.262-212.261-86.935-77.92-100.467-104.454-89.509-66.962-74.607-63.557-67.985-15.653264.312-52.963-47.4474.365-32.391-32.05584.9150.956-73.131NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:StatementClassOfStock

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

bsm:CommonUnits, us-gaap:SeriesBPreferredStock


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1414141414140.014141415
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType, us-gaap:IncomeStatementLocation

us-gaap:AllocatedShareBasedCompensationExpense

bsm:RestrictedCommonAndSubordinatedUnits, us-gaap:GeneralAndAdministrativeExpense


Allocated
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value1.1381.1261.2852.5522.5913.0193.4043.3713.4053.3642.941.8084.4873.192.7433.1362.6681.282
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.82.01.42.31.92.42.22.42.63.43.01.84.57.94.32.34.11.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax bsm:RestrictedCommonAndSubordinatedUnits us-gaap:GeneralAndAdministrativeExpense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bsm:RestrictedCommonUnits, us-gaap:GeneralAndAdministrativeExpense


Allocated
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.0370.9491.1261.285
Percentage of AllocatedShareBasedCompensationExpense0.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.12.01.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax bsm:RestrictedCommonUnits us-gaap:GeneralAndAdministrativeExpense0.00.00.00.0

us-gaap:RestrictedStockUnitsRSU, us-gaap:GeneralAndAdministrativeExpense


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value1.6972.1610.2951.098-4.6570.7270.6375.625.6115.1732.2423.7672.7232.3533.0665.4262.6132.071.26
Percentage of AllocatedShareBasedCompensationExpense0.00.025.997.5-362.428.524.6186.2164.8153.565.8112.092.6130.168.3170.195.366.047.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.42.40.51.9-5.00.60.54.53.53.61.73.82.82.33.113.44.11.51.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestrictedStockUnitsRSU us-gaap:GeneralAndAdministrativeExpense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1212109.3811111131414211622191825171717201618172318191417151415
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.314.413.214.519.912.713.212.510.717.06.614.013.914.226.817.617.716.936.916.844.727.023.613.930.416.310.111.812.212.1

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.6281.211.3531.6642.9644.4274.8635.3955.6525.5255.4375.5185.284.5214.0344.1723.9813.5072.7742.2821.4431.0480.8880.871.7152.9453.2173.443.4193.433
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.41.72.65.14.84.74.84.24.42.23.53.73.54.24.24.03.44.92.33.61.60.90.62.63.21.92.62.92.7

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1.0030.9411.0781.4372.7614.1734.6165.2365.4215.1975.1545.2435.0384.3263.72
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.11.42.24.84.54.54.64.04.22.13.33.53.33.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-30
Value151623-8.3717670959.017164602841-49.7353
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.118.136.6-14.581.862.170.77.266.738.420.132.1-49.739.0

us-gaap:NetIncomeLoss us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-30
Value151623-8.3717670727.15588342229-24.44727
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.076.779.454.156.679.570.549.250.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.118.136.6-14.581.862.154.35.736.121.716.022.6-24.419.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax bsm:PartnersEquityCommonUnits0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-31
Value10102518-13.621703464893.76715855233616215360-8.61436-22.1118.943-51.34650-107.5871466
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.612.232.428.5-23.676.233.757.566.83.064.635.116.528.017.621.754.359.4-15.236.5-54.513.9-51.337.2-166.015.851.8

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-1597000.0-1027000.0-1341000.0-1495000.0-3057000.0-4397000.0-4662000.0-4986000.0-5579000.0-5577000.0-6579000.0-5405000.0-4834000.0-6003000.0-3653000.0-4182000.0-3666000.0-3432000.0-3307000.0-1781000.0-1332000.0-861000.0-207000.0-807000.0-1542000.0-2894000.0-3126000.0-3375000.0-2680000.0-3341000.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.4-1.1-1.7-2.3-5.3-4.7-4.5-4.4-4.2-4.5-2.7-3.4-3.4-4.6-3.8-4.2-3.7-3.4-5.8-1.8-3.3-1.3-0.2-0.6-2.4-3.2-1.8-2.5-2.3-2.6

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4144451843102586262697573756672626259605960521498218670186715454
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.149.659.128.676.0110.256.654.946.855.430.646.553.150.975.963.963.658.5107.060.4148.082.0149.560.1287.177.8110.453.945.542.5

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value17173125-5.3148044751001417066334723265765-3.97939-19.47811-49.52354-121.22420-17.587616473
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.419.240.938.9-9.286.543.466.574.911.769.441.823.536.724.126.658.763.8-7.039.6-48.018.0-49.539.9-187.122.2-10.446.154.557.5

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value31000.0183000.012000.0168000.0-96000.0-1000.0179000.0365000.026000.0-98000.0-1202000.060000.0409000.0-1515000.0362000.0-1000.0282000.069000.0-538000.041000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.20.00.3-0.2-0.00.20.30.0-0.1-0.50.00.3-1.20.4-0.00.30.1-0.90.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value15163023-8.371764070959.01716460284119225461-7.28637-20.8110-49.7353-122.76617-20.713576269
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.118.139.236.6-14.581.838.862.170.77.266.738.420.132.120.322.455.060.5-12.837.8-51.316.7-49.739.3-189.419.0-12.243.652.254.8

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1178977645793103113134124246158142130959898101569940641001376491169132118127
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

srt:NaturalGasReserves


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value56424229303642415361786353534845
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax47.947.955.444.952.539.441.436.639.949.331.739.937.840.750.645.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax47.947.955.444.952.539.441.436.639.949.331.739.937.840.750.645.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:NaturalGasReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:OilReserves


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value53443634255263687457778277725041
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.749.447.553.044.056.061.860.455.146.231.452.354.155.853.042.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.749.447.553.044.056.061.860.455.146.231.452.354.155.853.042.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:OilReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstate


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value7.5052.3851.4141.3861.9754.308133.4846.7175.6457.612114.5994.9812
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.71.82.13.44.613.63.15.04.53.17.98.13.55.212.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.71.82.13.44.613.63.15.04.53.17.98.13.55.212.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value5861774338183103137163832461391091149589120124569940641001376491169132118127
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax49.668.8100.067.566.8196.7100.0121.5121.767.1100.088.376.687.5100.090.5122.3122.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value124212261243126014381522154515951724171117501754166916351576124612501199112811371126104510611161111812741326144414661468
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value21818918519736442044846058057754763659854948542745245140336434918615011193502512
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.615.414.915.625.427.629.028.833.733.831.336.335.933.630.834.336.237.735.732.031.017.914.29.68.439.438.6

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value124212261243126014381522154515951724171117501754166916351576124612501199112811371126104510611161111812741326
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value7164666122115910212112611315711710710087839490788478971039370108134
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.85.35.34.915.410.56.67.67.36.69.06.76.56.25.66.77.67.57.07.47.09.39.88.16.38.510.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1.0433.7891.7963.0571.63.048.1191.9663.9064.2475.4144.4417.0716.2975.6428.9117.487149.7724.8489.775.013135.576.0488.368147.99212173047
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.30.10.20.10.20.50.10.20.20.30.30.40.40.40.70.61.20.90.40.90.51.20.50.50.71.10.60.91.20.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1043000.03789000.01796000.03057000.01600000.03040000.08119000.01966000.03906000.04247000.05414000.04441000.07071000.05642000.09772000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.30.10.20.10.20.50.10.20.20.30.30.40.40.9

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value685961484558788495103113111999280687274686453444152545074
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.54.85.03.83.23.85.15.35.66.06.56.45.95.75.15.55.86.26.05.74.84.23.94.54.84.05.6

us-gaap:AccountsReceivableNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

bsm:OtherReceivables


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-31
Value4.6753.9913.7276.874.6434.8127.1927.0056.2315.3444.8484.0473.2393.151
Percentage of AccountsReceivableNetCurrent6.86.76.014.210.28.29.28.36.54.74.34.13.53.9
Percentage of Assets0.40.30.30.50.30.30.50.40.40.30.30.20.20.2
Percentage of Assets bsm:OtherReceivables0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bsm:ReceivablesFromContractsWithCustomer


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-31
Value635558414053717789107106948977
Percentage of AccountsReceivableNetCurrent93.293.394.085.889.891.890.891.793.595.395.795.996.596.1
Percentage of Assets5.14.54.73.32.83.54.64.95.26.26.15.75.54.9
Percentage of Assets bsm:ReceivablesFromContractsWithCustomer0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccountsReceivableNetCurrent us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

bsm:OtherReceivables


Accounts
Period End2020-12-312019-12-312018-12-31
Value3.7277.1925.344
Percentage of AccountsReceivableNetCurrent6.09.24.7
Percentage of Assets0.30.50.3
Percentage of Assets bsm:OtherReceivables0.00.00.0

us-gaap:CustomerContracts


Accounts
Period End2020-12-312019-12-312018-12-31
Value5871107
Percentage of AccountsReceivableNetCurrent94.090.895.3
Percentage of Assets4.74.66.2
Percentage of Assets us-gaap:CustomerContracts0.00.00.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value2.1161.3931.6681.7982.3291.9951.1681.4721.9771.5431.0011.2051.641.4721.2121.2691.7651.1211.0361.7182.161.0520.8561.4041.863108.538
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.10.10.10.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.10.10.10.20.80.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1163115511721192121113551434145715821586157516301554152714811156114310971044105010459389381051104611621189
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets93.694.394.294.684.289.092.891.391.892.790.093.093.193.494.092.891.491.592.592.492.889.788.490.693.591.289.6

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value3.322.2193.4073.5372.870.5635.3094.5745.9116.6394.149142.9522.2822.4643.6593.5333.9494.1424.8335.164.1275.03628353129
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.20.30.30.20.00.30.30.30.40.20.80.20.10.20.30.30.30.40.40.50.40.52.43.22.42.2

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value9.9258.3821512108.823221739386058523552383938503936485818151216
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.71.31.00.70.61.51.12.32.33.43.43.12.23.33.13.23.24.53.53.24.75.51.61.41.01.2

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value9556392115102923454864114925559424347714443526346659598
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.74.63.21.71.10.71.91.42.72.83.76.55.63.43.83.43.54.06.33.93.95.15.94.05.97.57.4

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value2078000.03495000.05213000.03327000.09104000.06367000.0
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.30.20.80.6

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value1792000.01736000.01654000.01623000.01634000.01412000.01633000.01058000.0957000.0528000.0417000.00
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value69556063867110610511090951139976707275635558572567
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax59.362.378.097.9149.976.8103.393.282.472.138.971.770.058.573.573.676.362.897.258.5142.140.267.5

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-12.54-0.2140.606150-1.0241.3910.21-2.82-21.634-24.379-20.079-52.466-31.093-60.166-337.767-18.115-34.281-64.086-17.782-30.882-137.796-35.08213
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-10.6-0.20.8231.8-1.81.50.2-2.5-16.1-19.5-8.2-33.2-21.8-46.0-353.9-18.4-34.8-62.9-31.4-31.1-339.7-54.513.2

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-60.099-53.479-62.262-212.261-86.935-77.92-100.467-104.454-89.509-66.962-74.607-63.557-67.985-15.653264-52.963-47.4474.365-32.391-32.055840.956-73.131
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-51.0-59.8-80.4-327.4-150.7-83.7-97.5-92.4-66.6-53.6-30.3-40.2-47.7-12.0276.9-53.8-48.24.3-57.1-32.3209.31.5-73.1

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value-2746000.01993000.01457000.0-1440000.0-5079000.0-1940000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.32.22.2-2.5-5.5-1.7

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value151519191923242729273429302830292826222829212023322727372323
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value8.779-2.62133.7-13.851-19.693-6.59-11.242-7.472-9.741.542126.064115.375-3.609-2.256.5686.615163.5463.039-11.101-2.6043.417-23.298-17.343-14.149-2.616
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value69556063867110610511090951139976707275635558572567
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax59.362.378.097.9149.976.8103.393.282.472.138.971.770.058.573.573.676.362.897.258.5142.140.267.5

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-30
Value151623-8.3717670959.017164602841-49.7353
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.118.136.6-14.581.862.170.77.266.738.420.132.1-49.739.0

us-gaap:NetIncomeLoss us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-30
Value151623-8.3717670727.15588342229-24.44727
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.076.779.454.156.679.570.549.250.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.118.136.6-14.581.862.154.35.736.121.716.022.6-24.419.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax bsm:PartnersEquityCommonUnits0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value15163023-8.371764070959.01716460284119225461-7.28637-20.8110-49.7353-122.76617-20.713576269
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.118.139.236.6-14.581.838.862.170.77.266.738.420.132.120.322.455.060.5-12.837.8-51.316.7-49.739.3-189.419.0-12.243.652.254.8

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3.0713.4622.3221.8252.474-2.8943.5783.8673.8169.2235.1879.5979.1246.226147.6756.2784.661107.981195.94.9485.696.1191.2433.8881.7982.1553.499
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-12.54-0.2140.606150-1.0241.3910.21-2.82-21.634-24.379-20.079-52.466-31.093-60.166-337.767-18.115-34.281-64.086-17.782-30.882-137.796-35.08213
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-10.6-0.20.8231.8-1.81.50.2-2.5-16.1-19.5-8.2-33.2-21.8-46.0-353.9-18.4-34.8-62.9-31.4-31.1-339.7-54.513.2

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets bsm:AssetAcquisition, us-gaap:StatementGeographical, us-gaap:SubsequentEventType

us-gaap:PaymentsToAcquireProductiveAssets

bsm:MineralAndRoyaltyAcreage, bsm:NorthernMidlandBasin, us-gaap:SubsequentEvent


Payments
Period End2021-05-31
Value10000000.0
Percentage of PaymentsToAcquireProductiveAssets100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-60.099-53.479-62.262-212.261-86.935-77.92-100.467-104.454-89.509-66.962-74.607-63.557-67.985-15.653264-52.963-47.4474.365-32.391-32.055840.956-73.131
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-51.0-59.8-80.4-327.4-150.7-83.7-97.5-92.4-66.6-53.6-30.3-40.2-47.7-12.0276.9-53.8-48.24.3-57.1-32.3209.31.5-73.1

bsm:AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable bsm:AssetAcquisition, us-gaap:StatementGeographical, us-gaap:SubsequentEventType

bsm:AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable

bsm:MineralAndRoyaltyAcreage, bsm:NorthernMidlandBasin, us-gaap:SubsequentEvent


Asset
Period End2021-05-31
Value10
Percentage of AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable100.0

bsm:AssetAcquisitionOwnershipInterestInWellsOperatedByOthersGrossPercent us-gaap:CounterpartyName, us-gaap:Range, us-gaap:StatementGeographical, us-gaap:PlanName

bsm:AssetAcquisitionOwnershipInterestInWellsOperatedByOthersGrossPercent

bsm:SecondPivotalFarmout, srt:Maximum, bsm:AngelinaCountyTexas, bsm:FarmoutAgreement


Asset
Period End2020-11-30
Value25.0
Percentage of AssetAcquisitionOwnershipInterestInWellsOperatedByOthersGrossPercent100.0

bsm:SecondPivotalFarmout, srt:Minimum, bsm:AngelinaCountyTexas, bsm:FarmoutAgreement


Asset
Period End2020-11-30
Value12.5
Percentage of AssetAcquisitionOwnershipInterestInWellsOperatedByOthersGrossPercent50.0

bsm:AssetAcquisitionPriceOfAcquisitionExpected bsm:AssetAcquisition, us-gaap:StatementGeographical, us-gaap:SubsequentEventType

bsm:AssetAcquisitionPriceOfAcquisitionExpected

bsm:MineralAndRoyaltyAcreage, bsm:NorthernMidlandBasin, us-gaap:SubsequentEvent


Asset
Period End2021-05-31
Value20
Percentage of AssetAcquisitionPriceOfAcquisitionExpected100.0

bsm:BusinessCombinationProFormaInformationWorkingInterestsInWellsDrilledAndCompletedActual us-gaap:BalanceSheetLocation, us-gaap:PlanName

bsm:BusinessCombinationProFormaInformationWorkingInterestsInWellsDrilledAndCompletedActual

us-gaap:OtherNoncurrentLiabilities, bsm:FarmoutAgreement


Business
Period End2021-06-302021-03-31
Value0.00.1
Percentage of BusinessCombinationProFormaInformationWorkingInterestsInWellsDrilledAndCompletedActual0.0100.0

bsm:BusinessCombinationProFormaInformationWorkingInterestsInWellsDrilledAndCompletedActual us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:BalanceSheetLocation, us-gaap:PlanName

bsm:CanaanResourcePartners, bsm:AngelinaCountyTexas, us-gaap:OtherNoncurrentLiabilities, bsm:FarmoutAgreement


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.00.10.00.0-8.08.9
Percentage of BusinessCombinationProFormaInformationWorkingInterestsInWellsDrilledAndCompletedActual0.00.00.00.00.00.00.00.0

bsm:ChargesOnPartnersEquityForAccruedDistributionEquivalentRights

bsm:ChargesOnPartnersEquityForAccruedDistributionEquivalentRights


Charges
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value180000.0237000.0133000.031000.068000.0511000.0766000.01044000.01333000.01061000.0643000.0661000.01715000.0366000.0284000.0329000.0226000.067000.0144000.0251000.06000.0
Percentage of ChargesOnPartnersEquityForAccruedDistributionEquivalentRights100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:ChargesOnPartnersEquityForAccruedDistributionEquivalentRights us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Charges
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value180000.0237000.0133000.031000.068000.0511000.0766000.01044000.01333000.01061000.0643000.0661000.01715000.0366000.0284000.0329000.0226000.067000.0144000.0251000.06000.0
Percentage of ChargesOnPartnersEquityForAccruedDistributionEquivalentRights100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:DistributablePreferredStockDividends

bsm:DistributablePreferredStockDividends


Distributable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.255.255.255.255.255.255.255.255.255.255.255.255.255.251.9250.00.00.0
Percentage of DistributablePreferredStockDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

bsm:ExploratoryWellsExpectedToBeDrilled us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:PlanName, us-gaap:SubsequentEventType

bsm:ExploratoryWellsExpectedToBeDrilled

bsm:Pivotal, bsm:SanAugustineCountyTexas, bsm:FarmoutAgreement, us-gaap:SubsequentEvent


Exploratory
Period End2020-09-30
Value4.0
Percentage of ExploratoryWellsExpectedToBeDrilled100.0

bsm:IncentiveCompensationCash us-gaap:IncomeStatementLocation

bsm:IncentiveCompensationCash

us-gaap:GeneralAndAdministrativeExpense


Incentive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value1.7291.3850.6340.5060.9631.0921.4711.7724.3660.8550.8180.3590.2140.4220.580.561.853.4344.0293.451
Percentage of IncentiveCompensationCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:IncentiveCompensationExpense us-gaap:IncomeStatementLocation

bsm:IncentiveCompensationExpense

us-gaap:GeneralAndAdministrativeExpense


Incentive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value4.84.8472.4592.98-1.9314.9585.28610139.987.0448.0346.4915.0838.5619.6527.6879.1249.6285.214
Percentage of IncentiveCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:IncentiveCompensationExpense us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:IncomeStatementLocation

srt:BoardOfDirectorsChairman, bsm:CommonUnits, us-gaap:GeneralAndAdministrativeExpense


Incentive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.3370.3520.3920.250.4780.5870.5870.5850.5810.581
Percentage of IncentiveCompensationExpense7.07.315.98.4-24.811.811.15.34.25.8

bsm:NetWorkingCapitalCostIncurredForAcquisitionOfProvedAndUnprovedOilAndGasProperties us-gaap:BusinessAcquisition

bsm:NetWorkingCapitalCostIncurredForAcquisitionOfProvedAndUnprovedOilAndGasProperties

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Net
Period End2021-06-30
Value300000.0
Percentage of NetWorkingCapitalCostIncurredForAcquisitionOfProvedAndUnprovedOilAndGasProperties100.0

bsm:PartitionAgreementOwnershipInterestInPartitionedDrillingUnitsPercent us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:PlanName

bsm:PartitionAgreementOwnershipInterestInPartitionedDrillingUnitsPercent

bsm:XTOEnergyInc, bsm:SanAugustineCountyTexas, bsm:FarmoutAgreement


Partition
Period End2021-03-31
Value100.0
Percentage of PartitionAgreementOwnershipInterestInPartitionedDrillingUnitsPercent100.0

bsm:PartnersCapitalAccountRestrictedCommonUnitsGranted us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersCapitalAccountRestrictedCommonUnitsGranted

bsm:CommonUnits


Partners
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value7000.01016000.029000.014000.01238000.0-4000.0627000.01545000.05000.094000.01177000.054000.011000.001565000.0291000.0-254000.0202000.0754000.0-24000.00
Percentage of PartnersCapitalAccountRestrictedCommonUnitsGranted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0

bsm:PaymentsForProceedsFromDerivativeInstruments

bsm:PaymentsForProceedsFromDerivativeInstruments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value174.523-14.555-21.288-36.552-8.954-9.542-13.646-2.931-1.743179.7966.294.375-2.872-4.98-3.081-4.278-5.569-5.302-13.337-20.581-16.693-12.377-16.705-17.45-1.4220.4260.8592.084
Percentage of PaymentsForProceedsFromDerivativeInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:PaymentsForProceedsFromDerivativeInstruments us-gaap:Energy, us-gaap:HedgingDesignation

srt:CrudeOil, us-gaap:Nondesignated


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value154.502-14.217-13.954-26.776-1.541-2.788-2.9381.745-4.5559.096119.38
Percentage of PaymentsForProceedsFromDerivativeInstruments91.799.597.765.573.317.229.221.5-59.5261.351.2115.1149.1

srt:NaturalGasReserves, us-gaap:Nondesignated


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.4350.021-0.338-7.334-9.776-7.413-6.754-10.708-4.6762.8128.678-1.484-3.09-0.773-2.653-0.954
Percentage of PaymentsForProceedsFromDerivativeInstruments8.30.52.334.526.782.870.878.5159.5-161.348.8-15.1-49.1-17.792.419.2

bsm:ProceedsFromFarmOutOfOilAndGasProperties

bsm:ProceedsFromFarmOutOfOilAndGasProperties


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.0230.1080.3643.7030.92713182945372318126.5920.00.00.0
Percentage of ProceedsFromFarmOutOfOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:AmortizationOfDeferredCharges

us-gaap:AmortizationOfDeferredCharges


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value627000.0257000.0263000.0262000.0259000.0260000.0262000.0263000.0259000.0257000.0252000.0231000.0217000.0205000.0216000.0225000.0221000.0215000.0277000.0200000.0197000.0197000.0211000.0242000.0241000.0241000.0239000.0243000.0242000.0241000.0
Percentage of AmortizationOfDeferredCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationAccretionExpense


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value298000.0292000.0295000.0286000.0278000.0272000.0288000.0275000.0277000.0277000.0283000.0278000.0273000.0269000.0266000.0260000.0253000.0247000.0212000.0206000.0200000.0274000.0270000.0265000.0269000.0271000.0617000.0148000.0148000.0147000.0
Percentage of AssetRetirementObligationAccretionExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationAcquisitionRelatedCosts

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Business
Period End2021-06-30
Value300000.0
Percentage of BusinessCombinationAcquisitionRelatedCosts100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Business
Period End2021-06-30
Value20
Percentage of BusinessCombinationConsiderationTransferred1100.0

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Business
Period End2021-06-30
Value10
Percentage of BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable100.0

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual us-gaap:CounterpartyName, us-gaap:PlanName

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual

bsm:CanaanResourcePartners, bsm:FarmoutAgreement


Business
Period End2021-06-30
Value0.0
Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual0.0

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:PlanName

bsm:CanaanResourcePartners, bsm:AngelinaCountyTexas, bsm:FarmoutAgreement


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.10.00.0900.30.52.88618
Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual0.00.00.00.00.00.00.00.00.0

bsm:Pivotal, bsm:SanAugustineCountyTexas, bsm:FarmoutAgreement


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.00.10.51180.712158627
Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual0.00.00.00.00.00.00.00.00.0

us-gaap:CapitalizedExploratoryWellCostChargedToExpense1

us-gaap:CapitalizedExploratoryWellCostChargedToExpense1


Capitalized
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value01049000.00000-1000.04000.01000.041000.06743000.0000
Percentage of CapitalizedExploratoryWellCostChargedToExpense10.0100.00.00.00.00.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves us-gaap:BusinessAcquisition

us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Costs
Period End2021-06-30
Value4.9
Percentage of CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves100.0

us-gaap:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties us-gaap:BusinessAcquisition

us-gaap:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Costs
Period End2021-06-30
Value15
Percentage of CostsIncurredAcquisitionOfUnprovedOilAndGasProperties100.0

us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure bsm:Period, us-gaap:Energy, us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure

bsm:FirstQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-30
Value0.91.8
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure100.0100.0

bsm:FourthQuarterTwoThousandTwenty, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.00.0100.01.84
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.00.00.0

bsm:FourthQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.0100.921.84
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.0102.2102.2

bsm:SecondQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312020-09-30
Value100.911.82
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0101.1101.1

bsm:ThirdQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.0100.921.84
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.0102.2102.2

us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure bsm:Period, us-gaap:Energy, us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:SubsequentEventType

bsm:FirstQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value0.9
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

bsm:FourthQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value0.92
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

bsm:SecondQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value0.91
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

bsm:ThirdQuarterTwoThousandTwentyOne, srt:NaturalGasReserves, bsm:SwapsContract, us-gaap:Swap, us-gaap:Nondesignated, us-gaap:SubsequentEvent


Derivative
Period End2020-11-03
Value0.92
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsPaid us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsPaid

bsm:CommonAndSubordinatedUnitholders


Distribution
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value313116617676767575685352525145454545434250
Percentage of DistributionMadeToLimitedPartnerCashDistributionsPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:CommonUnits


Distribution
Period End2021-06-302021-03-312020-06-302020-03-31
Value36361661
Percentage of DistributionMadeToLimitedPartnerCashDistributionsPaid0.00.0100.0100.0

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsPaid us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:StatementClassOfStock

bsm:PreferredUnits, us-gaap:SeriesBPreferredStock


Distribution
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value5.255.255.255.255.255.255.255.255.255.255.255.257.1750.00.00.0
Percentage of DistributionMadeToLimitedPartnerCashDistributionsPaid0.00.016.916.931.58.56.96.96.96.96.97.713.50.00.00.0

us-gaap:DistributionMadeToLimitedPartnerDistributionsPaidPerUnit us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:DistributionMadeToLimitedPartnerDistributionsPaidPerUnit

bsm:CommonUnits


Distribution
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value0.150.150.080.30.370.370.370.370.370.33750.31250.31250.31250.31250.28750.28750.28750.28750.26250.26250.26250.1615
Percentage of DistributionMadeToLimitedPartnerDistributionsPaidPerUnit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExplorationExpense

us-gaap:ExplorationExpense


Exploration
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2000.01073000.01000.04000.023000.01000.025000.064000.0304000.04000.01161000.034000.06745000.03000.02000.08000.046000.0562000.02000.06000.0629000.08000.0578000.01817000.0158000.039000.0187000.0440000.0
Percentage of ExplorationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnDerivativeInstrumentsNetPretax


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-59.48-27.882-3.64-21.086-19.17490-17.2492429-41.18383-18.514-33.347-16.333-8.485-9.3412222-24.1697.813-30.733103256-18.62719368.682-2.348-5.995
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax us-gaap:Energy, us-gaap:HedgingDesignation

srt:CrudeOil, us-gaap:Nondesignated


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-34.215-24.854-14.209-5.864-21.64777-21.504187.905-39.26187-18.83-30.018
Percentage of GainLossOnDerivativeInstrumentsNetPretax57.589.1390.427.8112.986.4124.774.627.195.3105.5101.790.0

srt:NaturalGasReserves, us-gaap:Nondesignated


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-25.265-3.02810-15.2222.473124.2556.15821-1.922-4.60.316-3.329-1.857140.152
Percentage of GainLossOnDerivativeInstrumentsNetPretax42.510.9-290.472.2-12.913.6-24.725.472.94.7-5.5-1.710.011.4-175.7-1.6

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GainLossOnSaleOfPropertyPlantEquipment


Gain
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.0240.00.00.00.00.0010.00.00.0020.00.00.0070.9240.0210.00.0924.684.853-0.0040.0170.007
Percentage of GainLossOnSaleOfPropertyPlantEquipment0.0100.00.00.00.00.0100.00.00.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ImpairmentOfOilAndGasProperties

us-gaap:ImpairmentOfOilAndGasProperties


Impairment
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.00.00.0510.00.00.00.00.00.00.00.00.6796.096922411813
Percentage of ImpairmentOfOilAndGasProperties0.00.00.0100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ImpairmentOfOilAndGasProperties us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring


Impairment
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.00.00.0510.00.00.00.00.00.00.00.00.6796.096922411813
Percentage of ImpairmentOfOilAndGasProperties0.00.00.0100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2.094-7.3412.4242.4373.479-14.2693.9812.2331.117-8.522-7.041153.391-0.5650.355-4.5983.397-2.7396.0342.796-11.045-20.8147.5475.9474.347-6.621.638.2775.01-6.914
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAssetRetirementObligations

us-gaap:IncreaseDecreaseInAssetRetirementObligations


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-55000.0-105000.0-49000.0-83000.0-34000.0-53000.0-52000.0-29000.0-259000.0-40000.0-21000.0-51000.0-24000.0-33000.0-115000.0-24000.0-46000.0-43000.0-80000.0-110000.0-73000.0-54000.0-21000.0-17000.0-47000.0-58000.0-126000.0-7000.0-4000.0-8000.0
Percentage of IncreaseDecreaseInAssetRetirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value723000.0-275000.0-130000.0-533000.0336000.0827000.0-304000.0-505000.0435000.0541000.0-203000.0-435000.0168000.0260000.0-57000.0-495000.0644000.085000.0-682000.0-141000.0807000.0196000.0-548000.0-459000.0547000.0365000.0-4631000.0-2068000.05913000.0333000.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet

us-gaap:InvestmentIncomeNet


Investment
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value1000.03000.031000.044000.047000.046000.053000.037000.033000.0-9000.033000.06000.0460000.0
Percentage of InvestmentIncomeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LimitedPartnersCapitalAccountDistributionAmount

us-gaap:LimitedPartnersCapitalAccountDistributionAmount


Limited
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3636311661767675685352
Percentage of LimitedPartnersCapitalAccountDistributionAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LimitedPartnersCapitalAccountDistributionAmount us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Limited
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3636311661764040363332
Percentage of LimitedPartnersCapitalAccountDistributionAmount100.0100.0100.0100.0100.0100.053.253.152.562.162.0

us-gaap:NetIncomeLossAllocatedToLimitedPartners

us-gaap:NetIncomeLossAllocatedToLimitedPartners


Net
Period End2021-06-302021-03-312020-06-302020-03-312015-03-312014-03-31
Value1010-13.621701466
Percentage of NetIncomeLossAllocatedToLimitedPartners100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAllocatedToLimitedPartners us-gaap:LimitedPartnersCapitalAccountByClass

bsm:CommonUnits


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value2518-13.621703464671.90583291724141632350.32623-7.4458.32-25.82425-54.109
Percentage of NetIncomeLossAllocatedToLimitedPartners0.00.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted

us-gaap:NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.050.05-0.070.34
Percentage of NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted100.0100.0100.0100.0

us-gaap:NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted us-gaap:LimitedPartnersCapitalAccountByClass

bsm:CommonUnits


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-31
Value0.120.09-0.070.34170.00.320.440.020.720.270.170.230.150.160.330.370.010.24-0.080.09-0.270.27-0.560.090.4
Percentage of NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted0.00.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax

us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.050.05-0.070.34
Percentage of NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax100.0100.0100.0100.0

us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax us-gaap:LimitedPartnersCapitalAccountByClass

bsm:CommonUnits


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-31
Value0.120.09-0.070.34170.00.320.450.020.780.270.170.230.150.160.330.370.010.24-0.080.09-0.270.27-0.560.090.4
Percentage of NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax0.00.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value3.8372.6643.7423.163.2933.8274.1684.3563.8495.2925.6484.2294.294.2484.3744.569
Percentage of OperatingLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnersCapitalAccountTreasuryUnitsPurchases

us-gaap:PartnersCapitalAccountTreasuryUnitsPurchases


Partners
Period End2021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.9570.0065.0296.164102.150.00.638.4410.340.00.07.8452.740.0204.2010.00.02.4920.523
Percentage of PartnersCapitalAccountTreasuryUnitsPurchases100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.00.0100.0100.00.00.0100.0100.0

us-gaap:PartnersCapitalAccountTreasuryUnitsPurchases us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Partners
Period End2021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-03-31
Value1.9570.0065.0296.164102.150.00.638.0990.340.00.07.5532.740.808203.3930.523
Percentage of PartnersCapitalAccountTreasuryUnitsPurchases100.0100.0100.0100.0100.0100.00.0100.095.9100.00.00.096.3100.00.0100.080.8100.0

us-gaap:PartnersCapitalAccountUnitBasedCompensation

us-gaap:PartnersCapitalAccountUnitBasedCompensation


Partners
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.825.3531.6132.2921.1593.3853.332135.1468.9918.52118135.654.148169.3584.5794.0085.94.9485.696.1191.243
Percentage of PartnersCapitalAccountUnitBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnersCapitalAccountUnitBasedCompensation us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Partners
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.825.3531.6132.2921.1593.3853.33213158.9918.52117125.3854.798168.3193.9713.4085.3243.9314.6664.3411.243
Percentage of PartnersCapitalAccountUnitBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0309.8100.0100.098.398.095.3115.798.488.986.785.090.279.482.070.9100.0

us-gaap:PartnersCapitalAccountUnitsTreasury us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PartnersCapitalAccountUnitsTreasury

bsm:CommonUnits


Partners
Period End2021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value223000.00503000.0377000.0588000.0137000.0035000.0451000.019000.001000.0426000.0303000.0-251000.01327000.0239000.0
Percentage of PartnersCapitalAccountUnitsTreasury100.00.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLeasingCosts

us-gaap:PaymentsForLeasingCosts


Payments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value021000.00782000.0062000.0637000.0234000.0840000.03275000.0524000.0514000.0484000.01336000.0
Percentage of PaymentsForLeasingCosts0.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfEquity us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PaymentsForRepurchaseOfEquity

bsm:CommonAndSubordinatedUnitholders


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0065.0290.0130.06.164101.5080.00.638.4410.340.00.07.845
Percentage of PaymentsForRepurchaseOfEquity0.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.00.0100.0

bsm:CommonUnits


Payments
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.01.9570.0065.029
Percentage of PaymentsForRepurchaseOfEquity0.00.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesGross

bsm:MineralAndRoyaltyAcreageInNorthernMidlandBasin


Payments
Period End2021-06-30
Value10.0
Percentage of PaymentsToAcquireBusinessesGross100.0

us-gaap:PaymentsToAcquireFurnitureAndFixtures

us-gaap:PaymentsToAcquireFurnitureAndFixtures


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-30
Value61000.02000.06000.05000.08000.02000.036000.0300000.0116000.02036000.06000.010000.005000.089000.022000.03000.093000.0420000.0005000.085000.068000.0515000.086000.0
Percentage of PaymentsToAcquireFurnitureAndFixtures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOilAndGasProperty

us-gaap:PaymentsToAcquireOilAndGasProperty


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-30
Value0.00.00.00.0280.0822.2932019175023323362218480.2434.55312610.00.121520.12116
Percentage of PaymentsToAcquireOilAndGasProperty0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2.4150.191-0.2540.0770.5983.5481.17613183147462746176.777161717261125119.582191316162613
Percentage of PaymentsToExploreAndDevelopOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockDividendRatePercentage us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PreferredStockDividendRatePercentage

bsm:SeriesBCumulativeConvertiblePreferredUnits


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-11-28
Value07.006.9300.070000.077.0
Percentage of PreferredStockDividendRatePercentage0.0100.00.0100.00.0100.00.00.00.0100.0100.0

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromLinesOfCredit


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value45393635226782807498109897010584495610344741696173498934
Percentage of ProceedsFromLinesOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.3511500.01.2660.6240.230.3180.0020.6197.1350.5030.7524.3484.6210.141.9930.0210.00.1440.033250.0260.00.4068.8450.3694.8175.439
Percentage of ProceedsFromSaleOfOilAndGasPropertyAndEquipment100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyHeldForSale us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:ProceedsFromSaleOfPropertyHeldForSale

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, bsm:PermianBasin


Proceeds
Period End2020-09-30
Value150
Percentage of ProceedsFromSaleOfPropertyHeldForSale100.0

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, bsm:PermianBasin


Proceeds
Period End2020-09-30
Value150
Percentage of ProceedsFromSaleOfPropertyHeldForSale99.7

us-gaap:ProceedsFromSaleOfPropertyHeldForSale us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, bsm:PermianBasin, us-gaap:SubsequentEvent


Proceeds
Period End2020-07-31
Value150
Percentage of ProceedsFromSaleOfPropertyHeldForSale0.0

us-gaap:ProceedsFromSaleOfPropertyHeldForSale us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

bsm:MidlandCountyTexas, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, bsm:DivestitureB


Proceeds
Period End2020-07-01
Value96
Percentage of ProceedsFromSaleOfPropertyHeldForSale0.0

bsm:MidlandCountyTexas, us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, bsm:DivestitureB


Proceeds
Period End2020-07-012020-05-01
Value95100
Percentage of ProceedsFromSaleOfPropertyHeldForSale0.00.0

us-gaap:ProductionTaxExpense

us-gaap:ProductionTaxExpense


Production
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value9.29611119.9059.55512151514141717141412111111129.2287.0127.0629.5178.1759.8198.25615121010
Percentage of ProductionTaxExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfLinesOfCredit


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value60496221187731011037373101108855758805131
Percentage of RepaymentsOfLinesOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesAcquisitions us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:StockIssuedDuringPeriodSharesAcquisitions

bsm:CommonUnits


Stock
Period End2021-06-30
Value1088000.0
Percentage of StockIssuedDuringPeriodSharesAcquisitions100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions

us-gaap:StockIssuedDuringPeriodValueAcquisitions


Stock
Period End2021-06-30
Value10
Percentage of StockIssuedDuringPeriodValueAcquisitions100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Stock
Period End2021-06-30
Value10
Percentage of StockIssuedDuringPeriodValueAcquisitions100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockValueAcquiredCostMethod

bsm:CommonUnits, bsm:NovemberTwoThousandTwentyEighteenRepurchaseProgram


Treasury
Period End2021-06-302020-09-302020-06-302020-03-312019-09-30
Value0.00.00.04.20.0
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.0100.00.0

us-gaap:UnrealizedGainLossOnCommodityContracts us-gaap:HedgingDesignation

us-gaap:UnrealizedGainLossOnCommodityContracts

us-gaap:Nondesignated


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-42.135-23.359-18.195-42.374-55.72681-26.7911026-42.926100-8.718-27.057-11.958-11.357-14.3211818-29.7382.51-44.07-9.9551644-35.3322.197359.108-1.489-3.911
Percentage of UnrealizedGainLossOnCommodityContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding


Weighted
Period End2021-06-302021-03-312020-06-302020-03-31
Value207207206206
Percentage of WeightedAverageLimitedPartnershipUnitsOutstanding100.0100.0100.0100.0

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding us-gaap:LimitedPartnersCapitalAccountByClass

bsm:CommonUnits


Weighted
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-31
Value0.015206206206122051501090.81106105103-0.37710197960.987959696-0.0019696167164
Percentage of WeightedAverageLimitedPartnershipUnitsOutstanding0.00.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstandingDiluted

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstandingDiluted


Weighted
Period End2021-06-302021-03-312020-06-302020-03-31
Value207207206206
Percentage of WeightedAverageLimitedPartnershipUnitsOutstandingDiluted100.0100.0100.0100.0

us-gaap:WeightedAverageLimitedPartnershipUnitsOutstandingDiluted us-gaap:LimitedPartnersCapitalAccountByClass

bsm:CommonUnits


Weighted
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value0.1292062062061220516511016106105103-0.37710197970.624969696-0.0019696
Percentage of WeightedAverageLimitedPartnershipUnitsOutstandingDiluted0.00.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:EntityCommonStockSharesOutstanding us-gaap:StatementClassOfStock

dei:EntityCommonStockSharesOutstanding

bsm:CommonUnits


Entity
Period End2020-07-312020-04-292020-02-192019-10-302019-07-302019-04-302019-02-192018-10-312018-08-012018-05-022018-02-202017-11-012017-08-022017-05-032017-02-222016-11-032016-03-04
Value20620620520520510910810810610510410310097979596
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsm:PreferredUnits


Entity
Period End2020-07-312020-04-292019-10-302019-07-302019-04-302018-10-312018-08-012018-05-022018-02-202017-11-012017-08-022017-05-032017-02-222016-11-032016-03-04
Value14141414141414140.0248030.0264260.0264260.0264260.0526910.0526910.077216
Percentage of EntityCommonStockSharesOutstanding7.17.17.17.113.413.613.914.00.00.00.00.00.10.10.1

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows


Future
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value9651619203816431267
Percentage of FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows100.0100.0100.0100.0100.0

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts


Future
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5954587036
Percentage of FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts100.0100.0100.0100.0100.0

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense


Future
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3019000.05244000.06333000.02655000.03516000.0
Percentage of FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense100.0100.0100.0100.0100.0

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows


Future
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value8031382175113591033
Percentage of FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows100.0100.0100.0100.0100.0

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts


Future
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value99177222211193
Percentage of FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts100.0100.0100.0100.0100.0

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows

srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows


Future
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value309534663497430
Percentage of FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows100.0100.0100.0100.0100.0

srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves


Standardized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value4938471087862603554
Percentage of StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent


Accrual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value8432000.08131000.05822000.04090000.03175000.03699000.0
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0

us-gaap:AccruedBonusesCurrent

us-gaap:AccruedBonusesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value5.0589.05716162016
Percentage of AccruedBonusesCurrent100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302016-12-312015-12-312015-06-302014-12-31
Value17161514141313109.9089.381
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationCurrent


Asset
Period End2020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value340000.0431000.0926000.0527000.0459000.0391000.0350000.0417000.0302000.0203000.00
Percentage of AssetRetirementObligationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:AssetRetirementObligationsNoncurrent


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value1717171616161515151514141414141313131311111010109.9089.6219.3815.961
Percentage of AssetRetirementObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation


Assets
Period End2020-07-012020-06-30
Value126126
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperation100.0100.0

us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities

us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1987187018651766165215431191
Percentage of CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3157330234413247269724822379
Percentage of CapitalizedCostsOilAndGasProducingActivitiesGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value117014311575148010449381187
Percentage of CapitalizedCostsOilAndGasProducingActivitiesNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsProvedProperties

us-gaap:CapitalizedCostsProvedProperties


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value2220222823772258209119571753
Percentage of CapitalizedCostsProvedProperties100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsUnprovedProperties

us-gaap:CapitalizedCostsUnprovedProperties


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value947937937947946107310731091108910841063109710411018988731730671605620609530524621574625626
Percentage of CapitalizedCostsUnprovedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount us-gaap:CreditFacility

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount

us-gaap:LineOfCredit


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value279256265162184165434484557594311306
Percentage of DebtInstrumentUnusedBorrowingCapacityAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value304289279283137262256262239240265198179114162188157112184151484
Percentage of DebtInstrumentUnusedBorrowingCapacityAmount0.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.0100.0

us-gaap:DebtWeightedAverageInterestRate us-gaap:CreditFacility

us-gaap:DebtWeightedAverageInterestRate

us-gaap:LineOfCredit


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value2.40.04050.04760.04060.03260.02450.02120.01920.01940.03750.02180.0241
Percentage of DebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtWeightedAverageInterestRate us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Debt
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value2.62.372.40.02430.03220.04050.0430.04660.04750.04760.04750.0460.04710.04060.03740.03730.03730.03260.02530.0192
Percentage of DebtWeightedAverageInterestRate0.00.0100.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.0100.0

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value371000.0243000.0766000.0668000.0580000.0543000.02110000.01750000.01395000.01028000.01813000.01496000.03202000.04079000.03648000.02883000.02295000.01873000.01485000.06300000.05264000.03849000.07902000.08401000.06247000.03714000.06530000.0
Percentage of DeferredCompensationLiabilityClassifiedNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetFairValueGrossLiability

us-gaap:DerivativeAssetFairValueGrossLiability


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value0.9771.2585.213114.2670.0164.3430.9673.4789.5572.2266.176.6148.216110.8311.1056.5283.8792.0342.5451.5640.03.20.3420.185
Percentage of DerivativeAssetFairValueGrossLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DerivativeAssetFairValueGrossLiability us-gaap:BalanceSheetLocation

bsm:CommodityDerivativeAssetsCurrent


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-312014-12-31
Value1.2585.213113.7360.0164.2380.6562.5187.2090.7761.9231.8156.3100.6141.1056.5283.8791.9842.3661.5643.0910.1420.185
Percentage of DerivativeAssetFairValueGrossLiability100.0100.0100.087.6100.097.667.872.475.434.931.227.476.791.273.9100.0100.0100.097.593.0100.096.641.5100.0

bsm:DeferredChargesAndOtherLongTermAssets


Derivative
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-06-30
Value0.9770.5310.00.1050.3110.962.3481.454.2474.7991.9161.0290.2170.00.00.00.050.1790.109
Percentage of DerivativeAssetFairValueGrossLiability100.012.40.02.432.227.624.665.168.872.623.38.826.10.00.00.02.57.03.4

us-gaap:OtherCurrentAssets


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value5.2134.2380.776103.8790.0
Percentage of DerivativeAssetFairValueGrossLiability100.097.634.991.2100.00.0

us-gaap:DerivativeAssetFairValueGrossLiability us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value0.9771.2585.213114.2670.0164.3430.9673.4789.5572.2266.176.614111.1050.00.02.0342.5450.0
Percentage of DerivativeAssetFairValueGrossLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.0

us-gaap:DerivativeAssetsCurrent

us-gaap:DerivativeAssetsCurrent


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.3151.1498.56945961433244.012370.00.00.00.0944.724130.013134648348.2943837
Percentage of DerivativeAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:HedgingDesignation

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value-85.511-43.376-20.017-1.82240961542315.11248-52.761-44.043-16.986-5.0286.329201.728-16.71913105464484.33639371.896-7.212-5.723-1.8125.538
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAsset


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.9772.3296.36219499619423416506.1766.6149.4671221133.8791515566448114037
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:BalanceSheetLocation

bsm:CommodityDerivativeAssetsCurrent


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1.5736.36219499619332611381.9231.8156.3105.338146.5283.8791515484834113937
Percentage of DerivativeFairValueOfDerivativeAsset67.5100.0100.098.8100.096.478.477.367.477.131.127.466.588.50.066.349.5100.099.598.786.274.871.099.197.5100.0

bsm:DeferredChargesAndOtherLongTermAssets


Derivative
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value0.9770.7560.610.00.7139.2697.9325.438114.2534.7993.1671.3921.8227.3216.6690.00.0730.2127.72816140.109
Percentage of DerivativeFairValueOfDerivativeAsset100.032.51.20.03.621.622.732.622.968.972.633.511.50.033.750.50.00.51.313.825.229.00.9

us-gaap:OtherCurrentAssets


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value6.3621938103.87948
Percentage of DerivativeFairValueOfDerivativeAsset100.096.477.188.5100.074.8

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.9772.3296.36219499619423416506.1766.6149.467127.16216.6690.01515566448114037
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.050.50.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1.0711.1498.56945961542317.102480.0060.01.2510.4576.329206.6690.013135464488.2943937
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral us-gaap:BalanceSheetLocation

bsm:CommodityDerivativeAssetsCurrent


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.3151.1498.56945961433244.012370.00.00.00.0944.724130.00.013134648348.2943837
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral29.4100.0100.099.8100.096.178.777.856.579.00.00.00.020.674.664.50.00.099.899.885.874.871.0100.098.0100.0

bsm:DeferredChargesAndOtherLongTermAssets


Derivative
Period End2021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value0.7560.0790.00.6088.9586.9723.09100.0060.01.2510.3631.6057.3216.6690.00.0230.0337.7281614
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral70.60.20.03.921.322.243.521.0100.00.0100.079.425.435.5100.00.00.20.214.225.229.0

us-gaap:OtherCurrentAssets


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.14914370.0940.048
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral100.096.179.020.60.074.8

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value1.0711.1498.56945961542317.102480.0060.01.2510.4576.329206.6690.0131364
Percentage of DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiability


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value864526219.3160.0164.520.9673.523112.226585026171.10511202.3235.4811.5640.07.1580.3790.185
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:BalanceSheetLocation

bsm:CommodityDerivativeLiabilitiesCurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value804524154.0470.0164.3970.6562.5189.1760.776423823140.6141.10511202.1214.2011.5640.04.1990.1420.185
Percentage of DerivativeFairValueOfDerivativeLiability92.6100.093.069.143.4100.097.367.871.579.534.972.576.289.286.60.0100.0100.097.791.376.6100.00.058.737.5100.0

bsm:CommodityDerivativeLiabilitiesLongTerm


Derivative
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-06-30
Value6.4411.8486.7295.2690.00.1230.3111.0052.3711.4516122.8632.2920.2170.00.00.4820.2021.280.02.959
Percentage of DerivativeFairValueOfDerivativeLiability7.47.030.956.60.02.732.228.520.565.127.523.810.813.40.00.00.02.38.723.40.041.3

us-gaap:OtherCurrentLiabilities


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value244.3970.77614200.0
Percentage of DerivativeFairValueOfDerivativeLiability93.097.334.986.697.70.0

us-gaap:OtherNoncurrentLiabilities


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.8480.1231.452.2920.4820.0
Percentage of DerivativeFairValueOfDerivativeLiability7.02.765.113.42.30.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value864526219.3160.0164.520.9673.523112.226585026170.8311.1054.941162.3235.4811.5640.07.1580.3790.185
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.043.181.2100.0100.0100.00.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-06-302015-03-31
Value854421105.0490.00.1770.00.0451.990.05244185.4850.00.04.941160.2892.9360.03.9580.037
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.00.0100.00.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral us-gaap:BalanceSheetLocation

bsm:CommodityDerivativeLiabilitiesCurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-06-30
Value8044193.6620.3110.00.1590.00.01.9670.04036174.2220.00.04.941160.1371.8350.01.108
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral93.6100.091.335.26.20.089.80.00.098.80.077.383.594.877.00.00.0100.097.147.462.50.028.0

bsm:CommodityDerivativeLiabilitiesLongTerm


Derivative
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-06-30
Value5.4641.8486.7294.7380.00.0180.00.0450.0230.0117.2650.9471.2630.00.00.00.4820.1521.1010.02.85
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral6.48.764.893.80.010.20.0100.01.20.022.716.55.223.00.00.00.02.952.637.50.072.0

us-gaap:OtherCurrentLiabilities


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value190.1590.04.222160.0
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral91.389.80.077.097.10.0

us-gaap:OtherNoncurrentLiabilities


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.8480.0180.01.2630.4820.0
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral8.710.20.023.02.90.0

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value854421105.0490.00.1770.00.0451.990.05244185.4850.00.04.941160.2892.9360.0
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.00.0100.00.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.0

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesCurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value8044193.6620.3110.00.1591.9670.04036174.2220.00.04.941160.1370.0
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.00.0

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:DerivativeLiabilitiesNoncurrent


Derivative
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value5.4641.8486.7294.7380.00.0180.00.0450.0230.0117.2650.9471.2630.00.00.00.4820.1520.0
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.00.0100.00.0100.0100.00.0100.0100.0100.0100.00.00.00.0100.0100.00.0

us-gaap:DerivativeLiabilityFairValueGrossAsset

us-gaap:DerivativeLiabilityFairValueGrossAsset


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value0.9771.2585.213114.2670.0164.3430.9673.4789.5572.2266.176.6148.216110.8311.1056.5283.8792.0342.5451.5640.03.20.3420.185
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:BalanceSheetLocation

bsm:CommodityDerivativeLiabilitiesCurrent


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value1.2585.213113.7360.0164.2380.6562.5187.2090.7761.9231.8156.3100.6141.1056.5283.8791.9842.3661.5640.03.0910.1420.185
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.087.6100.097.667.872.475.434.931.227.476.791.273.9100.0100.0100.097.593.0100.00.096.641.5100.0

bsm:CommodityDerivativeLiabilitiesLongTerm


Derivative
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-06-30
Value0.9770.5310.00.1050.3110.962.3481.454.2474.7991.9161.0290.2170.00.00.00.050.1790.00.109
Percentage of DerivativeLiabilityFairValueGrossAsset100.012.40.02.432.227.624.665.168.872.623.38.826.10.00.00.02.57.00.03.4

us-gaap:OtherCurrentLiabilities


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value5.2134.2380.776103.8790.0
Percentage of DerivativeLiabilityFairValueGrossAsset100.097.634.991.2100.00.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value0.9771.2585.213114.2670.0164.3430.9673.4789.5572.2266.176.614111.1050.00.02.0342.5450.0
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.0

us-gaap:DividendsPayableCurrentAndNoncurrent us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:DividendsPayableCurrentAndNoncurrent

bsm:SeriesBCumulativeConvertiblePreferredUnits


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value5300000.05300000.05300000.05300000.05300000.05300000.05300000.05300000.05300000.05300000.05300000.05300000.05300000.01900000.0
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

bsm:RestrictedCommonUnits


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3.88.5e-061.1e-051.57e-051319
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0100.0100.0100.0100.0100.0

us-gaap:PerformanceShares


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value2.06.38.410102.4
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions52.674117647.176363636.464331210.282.412.2

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Line
Period End2020-07-212020-05-012019-10-232018-10-312018-05-042017-04-252016-10-31
Value430460650675600550500
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermLineOfCredit

us-gaap:LongTermLineOfCredit


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value9611112114732338839441343643541040242143638836239338831629928511666436.0389394430453462
Percentage of LongTermLineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermLineOfCredit us-gaap:CreditFacility

us-gaap:LineOfCredit


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value12139441038831628511666436.0389394
Percentage of LongTermLineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermLineOfCredit us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value9611112114732338839441343643541040242143638836239338831629966
Percentage of LongTermLineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners us-gaap:Ownership

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

bsm:Comin


Minority
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value45.330.45330.45330.45330.5467
Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners100.0100.0100.0100.0100.0

bsm:Temin


Minority
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value42.630.42630.42630.42630.5737
Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners94.094.094.094.0104.9

us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment

us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value202520091987196719471938187019481921189318651830181317941766173617071679165216301601157115431430138212321191
Percentage of OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OilAndGasPropertySuccessfulEffortMethodGross

us-gaap:OilAndGasPropertySuccessfulEffortMethodGross


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value318731643157315831563291330234033501347734413461336733203247289228502776269726802646250924822481242723942379
Percentage of OilAndGasPropertySuccessfulEffortMethodGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OilAndGasPropertySuccessfulEffortMethodNet

us-gaap:OilAndGasPropertySuccessfulEffortMethodNet


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1161115411701190120913521431145415801584157516301554152614801155114210971044105010459379381051104511611187
Percentage of OilAndGasPropertySuccessfulEffortMethodNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLongTermDebtNoncurrent

us-gaap:OtherLongTermDebtNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value3.5333.8294.0734.3554.6094.9146.826.781817855926038196.5920.0
Percentage of OtherLongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PartnersCapital us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PartnersCapital

bsm:CommonUnits


Partners
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value725738760764775803798837845679714657612614603608573520489510511561574
Percentage of PartnersCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnersCapitalAccountUnits us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:PartnersCapitalAccountUnits

bsm:CommonUnits


Partners
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value2082072062062062062052052051091081081051041031031009795959596969696167164
Percentage of PartnersCapitalAccountUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest


Partners
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value725738760764775803798837845835904818772785768791770713671718723805831929903651653716326
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest us-gaap:LimitedPartnersCapitalAccountByClass

bsm:PartnersEquityCommonUnits


Partners
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value725738760764775803798837845679714657612614603608573520489510511561574621607648650
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.081.479.180.379.378.278.577.074.472.972.871.170.869.869.166.967.299.699.6

us-gaap:PrepaidExpenseAndOtherAssetsNoncurrent

us-gaap:PrepaidExpenseAndOtherAssetsNoncurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value7.6415.6745.3215.7486.2457.6768.689171512166.4976.8137.9867.4786.012115.1672.4022.61210192.532
Percentage of PrepaidExpenseAndOtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOtherAccumulatedDepreciation

us-gaap:PropertyPlantAndEquipmentOtherAccumulatedDepreciation


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1212121211111111110.01114141414141414141414141414141312
Percentage of PropertyPlantAndEquipmentOtherAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOtherNet

us-gaap:PropertyPlantAndEquipmentOtherNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1393000.01492000.01650000.01805000.01969000.02132000.02300000.02435000.02319000.02353000.0385000.0431000.0468000.0515000.0559000.0519000.0542000.0579000.0528000.0137000.0151000.0168000.0179000.067000.0562000.01098000.01664000.0
Percentage of PropertyPlantAndEquipmentOtherNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

bsm:RestrictedCommonUnits


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value13.6517.6717.2916.7215.2919.08
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0

us-gaap:PerformanceShares


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value14.9617.6615.9415.5114.9419.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue109.699.992.292.897.799.6

us-gaap:TemporaryEquityCarryingAmountAttributableToParent

us-gaap:TemporaryEquityCarryingAmountAttributableToParent


Temporary
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2982982982982982982982982982982983003222727345454545479120120120161161161161
Percentage of TemporaryEquityCarryingAmountAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TemporaryEquityCarryingAmountAttributableToParent us-gaap:LimitedPartnersCapitalAccountByClass

bsm:SeriesBCumulativeConvertiblePreferredUnits


Temporary
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value2982982982982982982982982982982982982983002950.0
Percentage of TemporaryEquityCarryingAmountAttributableToParent0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.091.60.0

us-gaap:TemporaryEquitySharesOutstanding us-gaap:LimitedPartnersCapitalAccountByClass

us-gaap:TemporaryEquitySharesOutstanding

bsm:CumulativeConvertiblePreferredUnits


Temporary
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value141414140.0
Percentage of TemporaryEquitySharesOutstanding100.0100.0100.0100.00.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType, us-gaap:IncomeStatementLocation
(None, 'us-gaap:GeneralAndAdministrativeExpense')
Allocated Share Based Compensation Expenseus-gaap: Award Type, us-gaap: Income Statement Location
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:AccountsReceivableNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
(None,)
Accounts Receivable Net Currentus-gaap: Accounts Notes Loans And Financing Receivable By Receivable Type
us-gaap:AccountsReceivableNetCurrent
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
(None,)
Accounts Receivable Net Currentus-gaap: Financing Receivable Recorded Investment By Class Of Financing Receivable