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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Comprehensive income (loss):      
Net income (loss) $ 112,494us-gaap_NetIncomeLoss $ (40,313)us-gaap_NetIncomeLoss $ (35,610)us-gaap_NetIncomeLoss
Other comprehensive income (loss) before income tax effect:      
Net unrealized loss on financial instruments 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (218)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Net loss reclassified to income on financial instruments 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax 567us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Net gain on foreign currency cash flow hedges reclassified as income (186)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet (186)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet (186)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
Net gain (loss) arising during the period (41,995)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 56,795us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax (16,691)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Prior service cost arising during the period (1,299)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Amortization of prior service benefit during the period (3,504)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (3,920)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (4,113)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Amortization of net loss during the period 10,312us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 8,174us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 9,837us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Change in equity in investee other comprehensive income 0cenx_ComprehensiveIncomeLossChangeInInvesteeBeforeTax 61cenx_ComprehensiveIncomeLossChangeInInvesteeBeforeTax (4,236)cenx_ComprehensiveIncomeLossChangeInInvesteeBeforeTax
Other comprehensive income (loss) before income tax effect (36,672)us-gaap_OtherComprehensiveIncomeLossBeforeTax 60,924us-gaap_OtherComprehensiveIncomeLossBeforeTax (15,040)us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax effect (1,829)us-gaap_OtherComprehensiveIncomeLossTax (1,564)us-gaap_OtherComprehensiveIncomeLossTax (1,564)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss) (38,501)us-gaap_OtherComprehensiveIncomeLossNetOfTax 59,360us-gaap_OtherComprehensiveIncomeLossNetOfTax (16,604)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income (loss) $ 73,993us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ 19,047us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ (52,214)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest