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Supplemental Information on Oil and Natural Gas Producing Activities - Standardized Measure of Discounted Future Cash Flows (Unaudited) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Extractive Industries [Abstract]        
Future cash inflows from production $ 21,022,320us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows $ 19,937,484us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows $ 29,482,544us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows  
Future production costs (6,499,366)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts (6,843,713)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts (8,899,465)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts  
Future development costs (1,810,201)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts [1] (2,546,680)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts [1] (4,021,051)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts [1]  
Future income tax expenses (3,223,740)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense (2,283,541)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense (3,721,509)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense  
Undiscounted future net cash flows 9,489,013us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows 8,263,550us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows 12,840,519us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows  
10% annual discount (5,401,261)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows (4,245,939)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows (7,000,151)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows  
Standardized measure of discounted future net cash flows $ 4,087,752us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves [2],[3] $ 4,017,611us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves [2],[3] $ 5,840,368us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves [2],[3] $ 5,216,337us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
[1] Includes abandonment costs.
[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] Includes approximately $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013, and 2012 respectively.