$BSM
Black Stone Minerals, L.P. Stock $bsm

$bsm Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000162828018002529 Filed on February 28, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$56.71M	$99.17M	$40.57M
YoY Change	-43.31%	-27.62%	-37.4%
Cost Of Revenue	$16.70M	$14.20M	$11.30M
YoY Change	14.38%	8.4%	-27.1%
Gross Profit	$40.00M	$84.90M	$29.30M
YoY Change	-53.22%	-31.48%	-40.57%
Gross Profit Margin	70.53%	85.61%	72.22%
Selling, General & Admin	$20.90M	$16.70M	$18.10M
YoY Change	-11.44%	-12.11%	-8.12%
% of Gross Profit	52.25%	19.67%	61.77%
Research & Development	$0.00	$0.00	$600.0K
YoY Change	-100.0%	-100.0%
% of Gross Profit	0.0%	0.0%	2.05%
Depreciation & Amortization	$22.80M	$28.73M	$29.20M
YoY Change	9.09%	23.37%	-9.41%
% of Gross Profit	57.0%	33.84%	99.67%
Operating Expenses	$44.00M	$59.86M	$60.05M
YoY Change	-6.38%	-27.29%	-67.72%
Operating Profit	-$3.979M	$39.32M	-$19.48M
YoY Change	-110.34%	-28.12%	-83.93%
Interest Expense	-$2.800M	$2.282M	$1.443M
YoY Change	211.11%	162.3%	-15.86%
% of Operating Profit		5.8%
Other Income/Expense, Net	-$500.0K	-$1.781M	-$1.332M
YoY Change	-171.43%	120.69%	-13.62%
Pretax Income	-$7.300M	$37.50M	-$20.80M
YoY Change	-85.31%	-30.43%	-83.06%
Income Tax
% Of Pretax Income
Net Earnings	-$7.286M	$37.54M	-$20.81M
YoY Change	-85.35%	-30.35%	-83.05%
Net Earnings / Revenue	-12.85%	37.85%	-51.3%
Basic Earnings Per Share
Diluted Earnings Per Share	-$37.59K	$196.1K	-$108.6K
COMMON SHARES
Basic Shares Outstanding
Diluted Shares Outstanding

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$9.800M	$4.800M	$9.800M
YoY Change	-25.76%	-14.29%	63.33%
Cash & Equivalents	$9.772M	$4.848M	$9.770M
Short-Term Investments
Other Short-Term Assets	$1.000M	$15.00M	$15.60M
YoY Change	-97.97%	-57.98%	52.94%
Inventory
Prepaid Expenses
Receivables	$68.18M	$64.39M	$53.60M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$78.99M	$84.24M	$78.90M
YoY Change	-23.75%	-10.05%	12.07%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.045B	$1.051B	$1.045B
YoY Change	11.3%	-0.13%	-0.08%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$5.200M	$2.400M	$2.600M
YoY Change	-72.92%	-84.87%	23.81%
Total Long-Term Assets	$1.050B	$1.053B	$1.048B
YoY Change	9.6%	-1.39%	-0.02%
TOTAL ASSETS
Total Short-Term Assets	$78.99M	$84.24M	$78.90M
Total Long-Term Assets	$1.050B	$1.053B	$1.048B
Total Assets	$1.129B	$1.137B	$1.127B
YoY Change	6.35%	-2.08%	0.74%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$4.142M	$4.833M	$5.200M
YoY Change	-17.75%	-82.81%	-85.27%
Accrued Expenses	$50.95M	$39.39M	$36.50M
YoY Change	-12.16%	116.13%	140.13%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$71.33M	$44.36M	$43.50M
YoY Change	13.15%	-4.25%	-33.59%
LONG-TERM LIABILITIES
Long-Term Debt	$316.0M	$299.0M	$285.0M
YoY Change	378.79%	595.35%	4650.0%
Other Long-Term Liabilities	$15.80M	$20.90M	$21.10M
YoY Change	-27.19%	-4.57%	-5.8%
Total Long-Term Liabilities	$331.8M	$319.9M	$306.1M
YoY Change	278.34%	392.91%	977.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$71.33M	$44.36M	$43.50M
Total Long-Term Liabilities	$331.8M	$319.9M	$306.1M
Total Liabilities	$403.2M	$364.3M	$350.6M
YoY Change	167.38%	227.43%	273.38%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$724.6M	$771.9M	$776.2M
YoY Change
Total Liabilities & Shareholders Equity	$1.129B	$1.137B	$1.127B
YoY Change	6.35%	-2.08%	0.73%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	-$7.286M	$37.54M	-$20.81M
YoY Change	-85.35%	-30.35%	-83.05%
Depreciation, Depletion And Amortization	$22.80M	$28.73M	$29.20M
YoY Change	9.09%	23.37%	-9.41%
Cash From Operating Activities	$55.10M	$58.10M	$57.60M
YoY Change	-18.37%	-20.52%	-17.36%
INVESTING ACTIVITIES
Capital Expenditures	-$17.80M	-$30.80M	-$138.0M
YoY Change	48.33%	-50.56%	379.17%
Acquisitions
YoY Change
Other Investing Activities	$0.00	$0.00	$200.0K
YoY Change	-100.0%
Cash From Investing Activities	-$17.70M	-$30.90M	-$137.8M
YoY Change	-234.09%	-50.32%	378.47%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-32.40M	-32.10M	84.90M
YoY Change	-55.68%	181.58%	-296.53%
NET CHANGE
Cash From Operating Activities	55.10M	58.10M	57.60M
Cash From Investing Activities	-17.70M	-30.90M	-137.8M
Cash From Financing Activities	-32.40M	-32.10M	84.90M
Net Change In Cash	5.000M	-4.900M	4.700M
YoY Change	-34.21%	880.0%	-304.35%
FREE CASH FLOW
Cash From Operating Activities	$55.10M	$58.10M	$57.60M
Capital Expenditures	-$17.80M	-$30.80M	-$138.0M
Free Cash Flow	$72.90M	$88.90M	$195.6M
YoY Change	-8.3%	-34.34%	98.58%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	6775000	USD
CY2016Q4	bsm	Accrued Capital Expenditures Current AccruedCapitalExpendituresCurrent	17775000	USD
CY2017Q4	bsm	Accrued Capital Expenditures Current AccruedCapitalExpendituresCurrent	28711000	USD
CY2015	bsm	Accrued Distribution Equivalent Rights AccruedDistributionEquivalentRights	159000	USD
CY2016	bsm	Accrued Distribution Equivalent Rights AccruedDistributionEquivalentRights	847000	USD
CY2017	bsm	Accrued Distribution Equivalent Rights AccruedDistributionEquivalentRights	2694000	USD
CY2016	bsm	Asset Acquisition Payments To Acquire Oil Mineral And Royalty Interests AssetAcquisitionPaymentsToAcquireOilMineralAndRoyaltyInterests	1200000	USD
CY2015	bsm	Asset Retirement Obligation Liabilities Incurred And Revision Of Estimate AssetRetirementObligationLiabilitiesIncurredAndRevisionOfEstimate	272000	USD
CY2016	bsm	Asset Retirement Obligation Liabilities Incurred And Revision Of Estimate AssetRetirementObligationLiabilitiesIncurredAndRevisionOfEstimate	2009000	USD
CY2017	bsm	Asset Retirement Obligation Liabilities Incurred And Revision Of Estimate AssetRetirementObligationLiabilitiesIncurredAndRevisionOfEstimate	391000	USD
CY2016Q2	bsm	Cash Settled Liabilities Reclassified To Equity Settled Liabilities CashSettledLiabilitiesReclassifiedToEquitySettledLiabilities	10100000	USD
CY2015	bsm	Change In Accrued Distributions Payable For Cumulative Convertible Preferred Units ChangeInAccruedDistributionsPayableForCumulativeConvertiblePreferredUnits	0	USD
CY2016	bsm	Change In Accrued Distributions Payable For Cumulative Convertible Preferred Units ChangeInAccruedDistributionsPayableForCumulativeConvertiblePreferredUnits	0	USD
CY2017	bsm	Change In Accrued Distributions Payable For Cumulative Convertible Preferred Units ChangeInAccruedDistributionsPayableForCumulativeConvertiblePreferredUnits	-1925000	USD
CY2015	bsm	Change In Accrued Distributions Payable For Redeemable Preferred Units ChangeInAccruedDistributionsPayableForRedeemablePreferredUnits	-2016000	USD
CY2016	bsm	Change In Accrued Distributions Payable For Redeemable Preferred Units ChangeInAccruedDistributionsPayableForRedeemablePreferredUnits	-1324000	USD
CY2017	bsm	Change In Accrued Distributions Payable For Redeemable Preferred Units ChangeInAccruedDistributionsPayableForRedeemablePreferredUnits	-660000	USD
CY2015	bsm	Charges On Partners Equity For Accrued Distribution Equivalent Rights ChargesOnPartnersEquityForAccruedDistributionEquivalentRights	159000	USD
CY2016	bsm	Charges On Partners Equity For Accrued Distribution Equivalent Rights ChargesOnPartnersEquityForAccruedDistributionEquivalentRights	688000	USD
CY2017	bsm	Charges On Partners Equity For Accrued Distribution Equivalent Rights ChargesOnPartnersEquityForAccruedDistributionEquivalentRights	2694000	USD
CY2017Q4	bsm	Cost Method Investments Maximum Ownership Percentage For Accounting Purposes CostMethodInvestmentsMaximumOwnershipPercentageForAccountingPurposes	0.20
CY2017Q4	bsm	Derivatives Number Of Counterparties DerivativesNumberOfCounterparties	9	counterparty
CY2015	bsm	Discount For Estimated Timing Of Cash Flows DiscountForEstimatedTimingOfCashFlows	0.10
CY2016	bsm	Discount For Estimated Timing Of Cash Flows DiscountForEstimatedTimingOfCashFlows	0.10
CY2017	bsm	Discount For Estimated Timing Of Cash Flows DiscountForEstimatedTimingOfCashFlows	0.10
CY2015	bsm	Distributable Preferred Stock Dividends DistributablePreferredStockDividends	0	USD
CY2016	bsm	Distributable Preferred Stock Dividends DistributablePreferredStockDividends	0	USD
CY2017	bsm	Distributable Preferred Stock Dividends DistributablePreferredStockDividends	1925000	USD
CY2015	bsm	Dividends On Predecessor Preferred Units DividendsOnPredecessorPreferredUnits	4040000	USD
CY2015	bsm	Lease Bonus And Other Income LeaseBonusAndOtherIncome	23080000	USD
CY2016	bsm	Lease Bonus And Other Income LeaseBonusAndOtherIncome	32079000	USD
CY2017	bsm	Lease Bonus And Other Income LeaseBonusAndOtherIncome	42062000	USD
CY2015	bsm	Payments For Proceeds From Derivative Instruments PaymentsForProceedsFromDerivativeInstruments	-63225000	USD
CY2016	bsm	Payments For Proceeds From Derivative Instruments PaymentsForProceedsFromDerivativeInstruments	-44789000	USD
CY2017	bsm	Payments For Proceeds From Derivative Instruments PaymentsForProceedsFromDerivativeInstruments	-15211000	USD
CY2015	bsm	Payments For Redemptions Of Redeemable Preferred Units PaymentsForRedemptionsOfRedeemablePreferredUnits	40747000	USD
CY2016	bsm	Payments For Redemptions Of Redeemable Preferred Units PaymentsForRedemptionsOfRedeemablePreferredUnits	18461000	USD
CY2017	bsm	Payments For Redemptions Of Redeemable Preferred Units PaymentsForRedemptionsOfRedeemablePreferredUnits	19704000	USD
CY2015	bsm	Proceeds From Farm Out Of Oil And Gas Properties ProceedsFromFarmOutOfOilAndGasProperties	0	USD
CY2016	bsm	Proceeds From Farm Out Of Oil And Gas Properties ProceedsFromFarmOutOfOilAndGasProperties	0	USD
CY2017	bsm	Proceeds From Farm Out Of Oil And Gas Properties ProceedsFromFarmOutOfOilAndGasProperties	19171000	USD
CY2015	bsm	Proceeds From Issuance Of Common Units Net Of Offering Costs ProceedsFromIssuanceOfCommonUnitsNetOfOfferingCosts	399087000	USD
CY2016	bsm	Proceeds From Issuance Of Common Units Net Of Offering Costs ProceedsFromIssuanceOfCommonUnitsNetOfOfferingCosts	0	USD
CY2017	bsm	Proceeds From Issuance Of Common Units Net Of Offering Costs ProceedsFromIssuanceOfCommonUnitsNetOfOfferingCosts	32458000	USD
CY2015	bsm	Public Offering Costs Capitalized And Offset Against Proceeds From Initial Public Offering PublicOfferingCostsCapitalizedAndOffsetAgainstProceedsFromInitialPublicOffering	7587000	USD
CY2016	bsm	Public Offering Costs Capitalized And Offset Against Proceeds From Initial Public Offering PublicOfferingCostsCapitalizedAndOffsetAgainstProceedsFromInitialPublicOffering	0	USD
CY2017	bsm	Public Offering Costs Capitalized And Offset Against Proceeds From Initial Public Offering PublicOfferingCostsCapitalizedAndOffsetAgainstProceedsFromInitialPublicOffering	0	USD
CY2017Q4	bsm	Reductionin Production Volume Due To Cap ReductioninProductionVolumeDueToCap	1.0	MBoe
CY2015	bsm	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cash Payments Of Vested Units ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCashPaymentsOfVestedUnits	0	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	68181000	USD
CY2016	bsm	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cash Payments Of Vested Units ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCashPaymentsOfVestedUnits	0	USD
CY2017	bsm	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cash Payments Of Vested Units ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCashPaymentsOfVestedUnits	0	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001621434
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1197800850	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	Black Stone Minerals, L.P.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	dei	Trading Symbol TradingSymbol	BSM
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	4142000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	2464000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	80695000	USD
CY2017Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	0	USD
CY2016Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	3175000	USD
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	4090000	USD
CY2016Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	20898000	USD
CY2017Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	16503000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	50952000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	52631000	USD
CY2015	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	935000	USD
CY2016	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	871000	USD
CY2017	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	877000	USD
CY2015	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	USD
CY2016	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	USD
CY2015Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	10585000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	13350000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	14509000	USD
CY2015	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1075000	USD
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	892000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1026000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	0	USD
CY2017Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	417000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2009000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	308000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	317000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	228000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	83000	USD
CY2016Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	13350000	USD
CY2016	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	0	USD
CY2017	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	30000	USD
CY2017Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	14092000	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	181000	USD
CY2017Q2	us-gaap	Assets Assets	1250086000	USD
CY2017Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	3247613000	USD
CY2016Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1044143000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	497103000	USD
CY2015	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	90288000	USD
CY2016Q1	us-gaap	Assets Assets	1045843000	USD
CY2016Q2	us-gaap	Assets Assets	1126830000	USD
CY2016Q3	us-gaap	Assets Assets	1137232000	USD
CY2016Q4	us-gaap	Assets Assets	1128827000	USD
CY2017Q1	us-gaap	Assets Assets	1199722000	USD
CY2017Q3	us-gaap	Assets Assets	1246070000	USD
CY2017Q4	us-gaap	Assets Assets	1576451000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	78989000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	87643000	USD
CY2016Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	1652930000	USD
CY2017Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	1766842000	USD
CY2016Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	2697073000	USD
CY2017Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1480771000	USD
CY2016Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	2091337000	USD
CY2017Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	2258893000	USD
CY2016Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	605736000	USD
CY2017Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	988720000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14803000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13233000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9772000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5642000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1570000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-3461000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-4130000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	39240000	USD
CY2016	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	6064000	USD
CY2017	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	6624000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	2302000	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	40242000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	96596000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	60994000	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	100888000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	383535000	USD
CY2015	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	60056000	USD
CY2016	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	73316000	USD
CY2017	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	81056000	USD
CY2015	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	2592000	USD
CY2016	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	645000	USD
CY2017	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	618000	USD
CY2015	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4873000	USD
CY2017	us-gaap	Deferred Compensation Arrangement With Individual Requisite Service Period1 DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1	P4Y
CY2016Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	1485000	USD
CY2017	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	561805000	USD
CY2016	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4793000	USD
CY2015	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	125944000	USD
CY2016	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	215091000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	114534000	USD
CY2016Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	3879000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	20598000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	17133000	USD
CY2017Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	3648000	USD
CY2016Q4	us-gaap	Deferred Revenue DeferredRevenue	518000	USD
CY2017Q4	us-gaap	Deferred Revenue DeferredRevenue	0	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	104298000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	102487000	USD
CY2017Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	11648000	USD
CY2016Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	0	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	94000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	3879000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	12105000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	0	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	457000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	16719000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	5485000	USD
CY2016Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	16237000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4222000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	482000	USD
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	1263000	USD
CY2016Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	3879000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	11648000	USD
CY2017	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3117000	USD
CY2015	us-gaap	Exploration Expense ExplorationExpense	2592000	USD
CY2016	us-gaap	Exploration Expense ExplorationExpense	645000	USD
CY2017	us-gaap	Exploration Expense ExplorationExpense	618000	USD
CY2015	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	165020000	USD
CY2016	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	86606000	USD
CY2017	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	113199000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	1211290000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	1267179000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	1643582000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	84746000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	36509000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	70111000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	0	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	3516000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	2655000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	920683000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	1033405000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	1359752000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	205861000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-454249000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	193749000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	211064000	USD
CY2016	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-36464000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	365711000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	77175000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	73139000	USD
CY2017	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	26902000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	430390000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	77574000	USD
CY2016Q4	us-gaap	General Partners Capital Account GeneralPartnersCapitalAccount	0	USD
CY2017Q4	us-gaap	General Partners Capital Account GeneralPartnersCapitalAccount	0	USD
CY2015	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	249569000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	931000	USD
CY2016	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	12000	USD
CY2015	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-143000	USD
CY2017	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	34000	USD
CY2016	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-317000	USD
CY2017	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-228000	USD
CY2015	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-660000	USD
CY2016	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-870000	USD
CY2017	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-2086000	USD
CY2015	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	669000	USD
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2015	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	1260000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	11221000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-23029000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-3585000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-33586000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	29759000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	6084000	USD
CY2016	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	0	USD
CY2017	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	2653000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-95000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	180000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	177000	USD
CY2015	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	584000	USD
CY2016	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	34751000	USD
CY2017	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	107891000	USD
CY2015	us-gaap	Interest Expense InterestExpense	6418000	USD
CY2016	us-gaap	Interest Expense InterestExpense	7547000	USD
CY2017	us-gaap	Interest Expense InterestExpense	15694000	USD
CY2015	us-gaap	Interest Paid InterestPaid	5478000	USD
CY2016	us-gaap	Interest Paid InterestPaid	6535000	USD
CY2017	us-gaap	Interest Paid InterestPaid	14761000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	58000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	656000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	49000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	1800000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	1900000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2500000	USD
CY2015	us-gaap	Lease Operating Expense LeaseOperatingExpense	21583000	USD
CY2016	us-gaap	Lease Operating Expense LeaseOperatingExpense	18755000	USD
CY2017	us-gaap	Lease Operating Expense LeaseOperatingExpense	17280000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	403166000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	485908000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1128827000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1576451000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	71331000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	59734000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	284735000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	196656000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	281852000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-221542000	USD
CY2016Q1	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	116000000	USD
CY2016Q2	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	285000000	USD
CY2016Q3	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	299000000	USD
CY2016Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	316000000	USD
CY2017Q1	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	388000000	USD
CY2017Q2	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	393000000	USD
CY2017Q3	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	362000000	USD
CY2017Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	388000000	USD
CY2015	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	81220000	USD
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	176055000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	194919000	USD
CY2015	us-gaap	Natural Gas Production Revenue NaturalGasProductionRevenue	116018000	USD
CY2016	us-gaap	Natural Gas Production Revenue NaturalGasProductionRevenue	122836000	USD
CY2017	us-gaap	Natural Gas Production Revenue NaturalGasProductionRevenue	190967000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-195307000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	21425000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	168267000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-90998000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-101755000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	20188000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	157153000	USD
CY2015	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	0	USD
CY2016	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	0	USD
CY2015	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-621065000	USD
CY2016	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-81456000	USD
CY2017	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	169608000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16779000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	152145000	USD
CY2017	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	0	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-108017000	USD
CY2016Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	8943000	USD
CY2016Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-22111000	USD
CY2016Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36219000	USD
CY2016Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-8614000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	14437000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	60460000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	53518000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	21388000	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	21496000	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	26553000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	34247000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-5450000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-7281000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-14931000	USD
CY2015	us-gaap	Oil And Condensate Revenue OilAndCondensateRevenue	163538000	USD
CY2016	us-gaap	Oil And Condensate Revenue OilAndCondensateRevenue	142382000	USD
CY2017	us-gaap	Oil And Condensate Revenue OilAndCondensateRevenue	169728000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion Amortization And Impairment OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment	1652930000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion Amortization And Impairment OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment	1766842000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	2697073000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	3247613000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Net OilAndGasPropertySuccessfulEffortMethodNet	1044143000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Net OilAndGasPropertySuccessfulEffortMethodNet	1480771000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	488779000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	233364000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	257575000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	-95855000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	11610000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-19478000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	39316000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-3979000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	27469000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	65015000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	57840000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	26216000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	23013000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	172084000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1708000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	1654000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	0	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	16000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	38000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	9104000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	3327000	USD
CY2015	us-gaap	Other Expenses OtherExpenses	1593000	USD
CY2016	us-gaap	Other Expenses OtherExpenses	0	USD
CY2017	us-gaap	Other Expenses OtherExpenses	0	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	0	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	417000	USD
CY2016Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	0	USD
CY2017Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	19171000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	910000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-390000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	714000	USD
CY2017	us-gaap	Partners Capital Account Acquisitions PartnersCapitalAccountAcquisitions	71723000	USD
CY2015	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	73205000	USD
CY2015	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	39240000	USD
CY2016	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	6064000	USD
CY2017	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	6624000	USD
CY2015	us-gaap	Partners Capital Account Public Sale Of Units PartnersCapitalAccountPublicSaleOfUnits	391500000	USD
CY2017	us-gaap	Partners Capital Account Public Sale Of Units PartnersCapitalAccountPublicSaleOfUnits	32458000	USD
CY2015	us-gaap	Partners Capital Account Treasury Units Purchases PartnersCapitalAccountTreasuryUnitsPurchases	3015000	USD
CY2016	us-gaap	Partners Capital Account Treasury Units Purchases PartnersCapitalAccountTreasuryUnitsPurchases	27436000	USD
CY2017	us-gaap	Partners Capital Account Treasury Units Purchases PartnersCapitalAccountTreasuryUnitsPurchases	8185000	USD
CY2015	us-gaap	Partners Capital Account Unit Based Compensation PartnersCapitalAccountUnitBasedCompensation	18000000	USD
CY2016	us-gaap	Partners Capital Account Unit Based Compensation PartnersCapitalAccountUnitBasedCompensation	23845000	USD
CY2017	us-gaap	Partners Capital Account Unit Based Compensation PartnersCapitalAccountUnitBasedCompensation	39357000	USD
CY2016Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	1021000	USD
CY2017Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	867000	USD
CY2014Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	653217000	USD
CY2015Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	831491000	USD
CY2016Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	671646000	USD
CY2017Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	768121000	USD
CY2015	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1376000	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	239000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3075000	USD
CY2015	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	208000	USD
CY2016	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	111000	USD
CY2017	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	120000	USD
CY2015	us-gaap	Payments To Acquire Furniture And Fixtures PaymentsToAcquireFurnitureAndFixtures	181000	USD
CY2016	us-gaap	Payments To Acquire Furniture And Fixtures PaymentsToAcquireFurnitureAndFixtures	425000	USD
CY2017	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	293469000	USD
CY2015	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	245600000	USD
CY2017	us-gaap	Payments To Acquire Furniture And Fixtures PaymentsToAcquireFurnitureAndFixtures	207000	USD
CY2015	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	62278000	USD
CY2016	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	141136000	USD
CY2017	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	425667000	USD
CY2015	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	54244000	USD
CY2016	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	80179000	USD
CY2017	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	58648000	USD
CY2016Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	1036000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	1212000	USD
CY2016Q4	us-gaap	Prepaid Expense And Other Assets Noncurrent PrepaidExpenseAndOtherAssetsNoncurrent	5167000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Noncurrent PrepaidExpenseAndOtherAssetsNoncurrent	7478000	USD
CY2015	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	7084000	USD
CY2016	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	28909000	USD
CY2017	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	11118000	USD
CY2015	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
CY2016	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	349000000	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	292500000	USD
CY2015	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-573600000	USD
CY2016	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-99000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-220500000	USD
CY2015	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	25705000	USD
CY2016	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	198000	USD
CY2017	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	11102000	USD
CY2015	us-gaap	Production Tax Expense ProductionTaxExpense	35767000	USD
CY2016	us-gaap	Production Tax Expense ProductionTaxExpense	35464000	USD
CY2017	us-gaap	Production Tax Expense ProductionTaxExpense	47474000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	-101305000	USD
CY2016Q1	us-gaap	Profit Loss ProfitLoss	10749000	USD
CY2016Q2	us-gaap	Profit Loss ProfitLoss	-20810000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	37535000	USD
CY2016Q4	us-gaap	Profit Loss ProfitLoss	-7286000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	20188000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	61583000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	54174000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	22034000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	19362000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	157153000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1044671000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1481330000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	14327000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	14433000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	528000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	559000	USD
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	12110	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	7309	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-3037	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	7844	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	2277	MBoe
CY2015Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	44590	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	15120	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	8449	MBoe
CY2014Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	51109	MBoe
CY2015Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	49788	MBoe
CY2016Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	63425	MBoe
CY2017Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	67945	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	10463	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	11596	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	13515	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	69	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	2269	MBoe
CY2016Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	55327	MBoe
CY2017Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	56727	MBoe
CY2015Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	5198	MBoe
CY2016Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	8098	MBoe
CY2017Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	11218	MBoe
CY2015	us-gaap	Redeemable Preferred Stock Dividends RedeemablePreferredStockDividends	7522000	USD
CY2016	us-gaap	Redeemable Preferred Stock Dividends RedeemablePreferredStockDividends	5763000	USD
CY2017	us-gaap	Redeemable Preferred Stock Dividends RedeemablePreferredStockDividends	3117000	USD
CY2015	us-gaap	Revenues Revenues	392924000	USD
CY2016Q1	us-gaap	Revenues Revenues	64381000	USD
CY2016Q2	us-gaap	Revenues Revenues	40569000	USD
CY2016Q3	us-gaap	Revenues Revenues	99171000	USD
CY2016Q4	us-gaap	Revenues Revenues	56712000	USD
CY2016	us-gaap	Revenues Revenues	260833000	USD
CY2017Q1	us-gaap	Revenues Revenues	124582000	USD
CY2017Q2	us-gaap	Revenues Revenues	120524000	USD
CY2017Q3	us-gaap	Revenues Revenues	89111000	USD
CY2017Q4	us-gaap	Revenues Revenues	95442000	USD
CY2017	us-gaap	Revenues Revenues	429659000	USD
CY2015	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-67911000	USD
CY2016	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	147507000	USD
CY2017	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	86228000	USD
CY2015	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	222206000	USD
CY2016	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	210354000	USD
CY2017	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	295941000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	18000000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	43138000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	33044000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	18.79
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.09
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	18.48
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	25100000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	9400000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	11900000	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	35394000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-13582000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	4366000	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	-588122000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	48043000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	259634000	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	114309000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	55662000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	60512000	USD
CY2014Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1143094000	USD
CY2015Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	554972000	USD
CY2016Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	603015000	USD
CY2017Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	862649000	USD
CY2016Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	50000000	USD
CY2016Q1	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	54001000	USD
CY2016Q2	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	54001000	USD
CY2016Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	54015000	USD
CY2016Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	54015000	USD
CY2017Q1	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	34145000	USD
CY2017Q2	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	27085000	USD
CY2017Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	27092000	USD
CY2017Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	322422000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	1300000	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	20200000	USD
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Concentration of Credit Risk </font></div><div style="line-height:120%;padding-top:16px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Financial instruments that potentially subject the Partnership to credit risk consist principally of cash and cash equivalents, accounts receivable, and commodity derivative financial instruments. </font></div><div style="line-height:120%;padding-top:16px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Partnership maintains cash and cash equivalent balances with major financial institutions. At times, those balances exceed federally insured limits; however, no losses have been incurred. </font></div><div style="line-height:120%;padding-top:16px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Partnership’s customer base is made up of its lessees, which consist of integrated oil and gas companies to independent producers and operators. The Partnership’s credit risk may also include the purchasers of oil and natural gas produced from the Partnership’s properties. The Partnership attempts to limit the amount of credit exposure to any one company through procedures that include credit approvals, credit limits and terms, and prepayments. The Partnership believes the credit quality of its customer base is high and has not experienced significant write-offs in its accounts receivable balances. See Note 7 – Significant Customers for further discussion. </font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates </font></div><div style="line-height:120%;padding-top:16px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, as well as reported amounts of revenues and expenses for the periods herein. Actual results could differ from those estimates.</font></div><div style="line-height:120%;padding-top:16px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Partnership’s consolidated financial statements are based on a number of significant estimates including oil and natural gas reserve quantities that are the basis for the calculations of depreciation, depletion, and amortization (“DD&A”) and impairment of oil and natural gas properties. Reservoir engineering is a subjective process of estimating underground accumulations of oil and natural gas. There are numerous uncertainties inherent in estimating quantities of proved oil and natural gas reserves. The accuracy of any reserve estimates is a function of the quality of available data and of engineering and geological interpretation and judgment. As a result, reserve estimates may differ from the quantities of oil and natural gas that are ultimately recovered. The Partnership’s reserve estimates are determined by an independent petroleum engineering firm. Other items subject to significant estimates and assumptions include the carrying amount of oil and natural gas properties, valuation of commodity derivative financial instruments, valuation of future asset retirement obligations (“ARO”), determination of revenue accruals, and the determination of the fair value of equity-based awards.</font></div><div style="line-height:120%;padding-top:16px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Partnership evaluates estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic and commodity price environment. The volatility of commodity prices results in increased uncertainty inherent in such estimates and assumptions. A significant decline in oil or natural gas prices could result in a reduction in the Partnership’s fair value estimates and cause the Partnership to perform analyses to determine if its oil and natural gas properties are impaired. As future commodity prices cannot be predicted accurately, actual results could differ significantly from estimates.</font></div></div>

Files In Submission

Name	View Source	Status
0001628280-18-002529-index-headers.html	Edgar Link	pending
0001628280-18-002529-index.html	Edgar Link	pending
0001628280-18-002529.txt	Edgar Link	pending
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bsm-20171231_pre.xml	Edgar Link	unprocessable
bsm10-kdocx12312017.htm	Edgar Link	pending
chart-0032ded449bc587dace.jpg	Edgar Link	pending
exhibit1017-bsmxstiawardle.htm	Edgar Link	pending
exhibit104-firstamendmentt.htm	Edgar Link	pending
exhibit211-subsidiariesofb.htm	Edgar Link	pending
exhibit231-consentofindepe.htm	Edgar Link	pending
exhibit232-consentofindepe.htm	Edgar Link	pending
exhibit233-consentofindepe.htm	Edgar Link	pending
exhibit233consentofin_image.jpg	Edgar Link	pending
exhibit311-certificationof.htm	Edgar Link	pending
exhibit312-certificationof.htm	Edgar Link	pending
exhibit321-certificationof.htm	Edgar Link	pending
exhibit991nsaiblackstoneye.htm	Edgar Link	pending
exhibit991nsaiblackst_image1.jpg	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
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map.jpg	Edgar Link	pending
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2016 Q4 Form 10-K Financial Statement

#000162828018002529 Filed on February 28, 2018

Income Statement

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Facts In Submission

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$BSM Black Stone Minerals, L.P. Stock $bsm

2016 Q4 Form 10-K Financial Statement

#000162828018002529 Filed on February 28, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BSM
Black Stone Minerals, L.P. Stock $bsm