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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) (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Present value $ 4,017,611us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves [1] $ 5,840,368us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves [1] $ 5,216,337us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves [1] $ 3,683,515us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Noncontrolling Interest        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Present value $ 781,600us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 952,700us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 932,800us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		  
[1] Includes approximately $781.6 million, $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2013, 2012, and 2011 respectively.