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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |
Net income | $ 104,468 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 279,773 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 131,730 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |
Reclassification adjustment for settled cash flow hedge contracts | 86,726 us-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] | 53,815 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | [2]
Pension and postretirement benefits: |  |  |  |  |  |
Net gain (loss) | (325)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | [3] | 4,641 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | [3] | 1,258 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | [3]
Amortization of prior service cost | 0 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [4] | 0 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [4] | 134 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [4]
Amortization of (gain) net loss | (16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | [5] | 386 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | [5] | 8,582 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | [5]
Total other comprehensive income (loss) | 6,210 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  | (32,241)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  | (80,667)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
Comprehensive income (loss) | $ 110,678 us-gaap_ComprehensiveIncomeNetOfTax |  | $ 247,532 us-gaap_ComprehensiveIncomeNetOfTax |  | $ 51,063 us-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.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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