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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value $ 68,568us-gaap_AssetsFairValueDisclosure $ 132,934us-gaap_AssetsFairValueDisclosure
Liabilities measured at fair value 54,831us-gaap_LiabilitiesFairValueDisclosure 74,647us-gaap_LiabilitiesFairValueDisclosure
Restricted deposits
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 27,955us-gaap_AssetsFairValueDisclosure
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Commodity derivatives contracts
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 26,905us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value 54,831us-gaap_LiabilitiesFairValueDisclosure
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Investments
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 13,708us-gaap_AssetsFairValueDisclosure
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Interest rate swap
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Liabilities measured at fair value   2,395us-gaap_LiabilitiesFairValueDisclosure
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Fair Value Measurements Level 1
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 41,663us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value 0us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value Measurements Level 1 | Restricted deposits
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 27,955us-gaap_AssetsFairValueDisclosure
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Fair Value Measurements Level 1 | Commodity derivatives contracts
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value 0us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value Measurements Level 1 | Investments
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 13,708us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
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Fair Value Measurements Level 1 | Interest rate swap
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Liabilities measured at fair value   0us-gaap_LiabilitiesFairValueDisclosure
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Fair Value Measurements Level 2
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 50,274us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Liabilities measured at fair value 78,200us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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= us-gaap_FairValueMeasurementsRecurringMember		 109,716us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value Measurements Level 2 | Restricted deposits
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value Measurements Level 2 | Commodity derivatives contracts
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 50,274us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value 78,200us-gaap_LiabilitiesFairValueDisclosure
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Fair Value Measurements Level 2 | Investments
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Fair Value Measurements Level 2 | Interest rate swap
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Liabilities measured at fair value   2,395us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value Measurements Level 3
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value 0us-gaap_LiabilitiesFairValueDisclosure
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Fair Value Measurements Level 3 | Restricted deposits
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Fair Value Measurements Level 3 | Commodity derivatives contracts
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value 0us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
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Fair Value Measurements Level 3 | Investments
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Fair Value Measurements Level 3 | Interest rate swap
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Liabilities measured at fair value   0us-gaap_LiabilitiesFairValueDisclosure
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Netting
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value (23,369)us-gaap_AssetsFairValueDisclosure
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= us-gaap_NettingAndCollateralMember
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Liabilities measured at fair value (23,369)us-gaap_LiabilitiesFairValueDisclosure
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Netting | Restricted deposits
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Netting | Commodity derivatives contracts
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value (23,369)us-gaap_AssetsFairValueDisclosure
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Liabilities measured at fair value (23,369)us-gaap_LiabilitiesFairValueDisclosure
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Netting | Investments
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Assets measured at fair value 0us-gaap_AssetsFairValueDisclosure
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Netting | Interest rate swap
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Liabilities measured at fair value   $ 0us-gaap_LiabilitiesFairValueDisclosure
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[1] Represents the impact of netting assets and liabilities with counterparties with which the right of offset exists.