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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 104,468us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 279,773us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 131,730us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive income (loss), net of taxes:      
Reclassification adjustment for settled cash flow hedge contracts 86,726us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] (34,548)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] (144,456)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1]
Changes in fair value of cash flow hedge contracts (80,175)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [2] (2,720)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [2] 53,815us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [2]
Pension and postretirement benefits:      
Net gain (loss) (325)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [3] 4,641us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [3] 1,258us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [3]
Amortization of prior service cost 0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4] 0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4] 134us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4]
Amortization of (gain) net loss (16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [5] 386us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [5] 8,582us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [5]
Total other comprehensive income (loss) 6,210us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (32,241)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (80,667)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) $ 110,678us-gaap_ComprehensiveIncomeNetOfTax $ 247,532us-gaap_ComprehensiveIncomeNetOfTax $ 51,063us-gaap_ComprehensiveIncomeNetOfTax
[1] Net of income taxes of $(57,477), $22,454 and $91,870 for the year ended December 31, 2014, 2013 and 2012, respectively.
[2] Net of income taxes of $53,135, $1,803 and $(34,890) for the year ended December 31, 2014, 2013 and 2012, respectively.
[3] Net of income taxes of $48, $(2,977) and $(815) for the year ended December 31, 2014, 2013 and 2012, respectively.
[4] Net of income taxes of $(87) for the year ended December 31, 2012.
[5] Net of income taxes of $10, $(255) and $(5,324) for the year ended December 31, 2014, 2013 and 2012, respectively.