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Supplemental Information on Oil and Natural Gas Producing Activities - Standardized Measure of Discounted Future Net Cash Flows (Unaudited) (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Standardized measure of discounted future net cash flows $ 4,017,611us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure [1] $ 5,840,368us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure [1] $ 5,216,337us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure [1]
Noncontrolling Interest      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Standardized measure of discounted future net cash flows $ 781,600us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 952,700us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 932,800us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure
/ 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.