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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Comprehensive income (loss): |  |  |
Net income (loss) | $ 112,494 us-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 | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | (218)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Net loss reclassified to income on financial instruments | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 567 us-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 | 56,795 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | (16,691)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Prior service cost arising during the period | (1,299)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax | 0 us-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 | 10,312 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax | 8,174 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax | 9,837 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Change in equity in investee other comprehensive income | 0 cenx_ComprehensiveIncomeLossChangeInInvesteeBeforeTax | 61 cenx_ComprehensiveIncomeLossChangeInInvesteeBeforeTax | (4,236)cenx_ComprehensiveIncomeLossChangeInInvesteeBeforeTax
Other comprehensive income (loss) before income tax effect | (36,672)us-gaap_OtherComprehensiveIncomeLossBeforeTax | 60,924 us-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 | 59,360 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (16,604)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income (loss) | $ 73,993 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | $ 19,047 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | $ (52,214)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

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