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Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Comprehensive Loss, Before Tax [Abstract]      
Foreign currency translation adjustment $ 265us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ 166us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ (54)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Reclassification of net gains on derivative instruments to net income (1,110)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (1,188)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (1,188)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Realized loss on cash flow hedging derivatives (18,388)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Pension and postretirement medical liability adjustment 134us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 1,568us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax (897)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive loss, before tax (19,099)us-gaap_OtherComprehensiveIncomeLossBeforeTax 546us-gaap_OtherComprehensiveIncomeLossBeforeTax (2,139)us-gaap_OtherComprehensiveIncomeLossBeforeTax
Other Comprehensive Loss, Tax [Abstract]      
Foreign currency translation adjustment 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Reclassification of net gains on derivative instruments to net income 426us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 458us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 456us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
Realized loss on cash flow hedging derivatives 7,243us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Pension and postretirement medical liability adjustment (52)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (605)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 344us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other comprehensive loss, tax 7,617us-gaap_OtherComprehensiveIncomeLossTax (147)us-gaap_OtherComprehensiveIncomeLossTax 800us-gaap_OtherComprehensiveIncomeLossTax
Other Comprehensive Loss, Net of Tax [Abstract]      
Foreign currency translation adjustment 265us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 166us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (54)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Reclassification of net gains on derivative instruments to net income (684)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (730)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (732)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Realized loss on cash flow hedging activities (11,145)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Postretirement medical liability adjustment 82us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 963us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (553)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive loss, net of tax (11,482)us-gaap_OtherComprehensiveIncomeLossNetOfTax 399us-gaap_OtherComprehensiveIncomeLossNetOfTax (1,339)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Accumulated Other Comprehensive Income, Net of Tax [Abstract]      
Foreign currency translation 797us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 532us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Derivative instruments designated as cash flow hedges (8,316)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 3,513us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Pension and postretirement medical plans (1,247)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (1,329)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Accumulated other comprehensive income (8,766)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,716us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Other Comprehensive Loss, Net of Tax [Abstract]      
Other comprehensive loss, net of tax (11,829)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (730)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Accumulated Other Comprehensive Income, Net of Tax [Abstract]      
Accumulated other comprehensive income (8,316)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 3,513us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 4,243us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Accumulated Defined Benefit Plans Adjustment [Member]      
Other Comprehensive Loss, Net of Tax [Abstract]      
Other comprehensive loss, net of tax 82us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 963us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Accumulated Other Comprehensive Income, Net of Tax [Abstract]      
Accumulated other comprehensive income $ (1,247)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 $ (1,329)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 $ (2,292)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember