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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Comprehensive income (loss):    
Net income (loss) $ 73,779us-gaap_NetIncomeLoss $ (20,104)us-gaap_NetIncomeLoss
Other comprehensive income before income tax effect:    
Net gain on foreign currency cash flow hedges reclassified as income (47)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet (47)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
Amortization of prior service benefit during the period (936)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (952)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Amortization of net loss during the period 1,444us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 1,811us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Other comprehensive income before income tax effect 461us-gaap_OtherComprehensiveIncomeLossBeforeTax 812us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax effect (383)us-gaap_OtherComprehensiveIncomeLossTax (713)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income 78us-gaap_OtherComprehensiveIncomeLossNetOfTax 99us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income (loss) $ 73,857us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ (20,005)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest