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Supplemental Information on Oil and Natural Gas Producing Activities - Estimate of Changes in Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Extractive Industries [Abstract] |  |  |  |  |  |
Present value, beginning balance | $ 4,017,611 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1],[2] | $ 5,840,368 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1],[2] | $ 5,216,337 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves |
Changes during the year |  |  |  |  |  |
Revenues less production and other costs | (1,043,060)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts |  | (1,271,559)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts |  | (1,234,918)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts |
Net changes in prices, production and other costs | 331,694 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts |  | 271,566 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts |  | (2,555,391)us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts |
Development costs incurred | 364,262 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod |  | 474,275 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod |  | 766,943 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod |
Net changes in future development costs | (341,183)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts |  | (207,729)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts |  | (45,397)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts |
Extensions and discoveries | 1,785,963 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts |  | 1,406,102 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts |  | 2,092,423 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts |
Revisions of previous quantity estimates | (77,688)us-gaap_RevisionsOfPreviousQuantityEstimates |  | (296,418)us-gaap_RevisionsOfPreviousQuantityEstimates |  | (530,755)us-gaap_RevisionsOfPreviousQuantityEstimates |
Accretion of discount | 477,458 us-gaap_AccretionOfDiscount |  | 711,385 us-gaap_AccretionOfDiscount |  | 678,200 us-gaap_AccretionOfDiscount |
Net change in income taxes | (256,371)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves |  | 477,328 us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves |  | 11,433 us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves |
Purchases of reserves in-place | 50,958 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace |  | 1,628 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace |  | 1,708,301 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace |
Sales of reserves in-place | (1,058,330)us-gaap_DecreaseDueToSalesOfMineralsInPlace |  | (3,172,187)us-gaap_DecreaseDueToSalesOfMineralsInPlace |  | (410,415)us-gaap_DecreaseDueToSalesOfMineralsInPlace |
Timing differences and other | (163,562)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther | [3] | (217,148)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther | [3] | 143,607 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther | [3]
Net change for the year | 70,141 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease |  | (1,822,757)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease |  | 624,031 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease |
Present value, ending balance | $ 4,087,752 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1],[2] | $ 4,017,611 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1],[2] | $ 5,840,368 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1],[2]
[1] | Includes approximately $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013 and 2012 respectively.
[2] | Includes approximately $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013, and 2012 respectively.
[3] | The change in timing differences and other are related to revisions in the Company’s estimated time of production and development.

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