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Changes in components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance, Accumulated Other Comprehensive Loss $ (117,682)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax       $ (91,832)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax       $ (117,682)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (91,832)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (151,192)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (134,588)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclassifications                 (43,345)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax 56,787us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax (21,215)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax  
Net amount reclassified to net income (loss)                 4,844us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax 2,573us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax 4,611us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax  
Elimination of equity in investee resulting from acquisition                 12,651cenx_EliminationOfEquityInInvestee      
Cost of goods sold                 1,728,586us-gaap_CostOfGoodsSold 1,414,790us-gaap_CostOfGoodsSold 1,225,769us-gaap_CostOfGoodsSold  
Selling, general and administrative expenses                 49,195us-gaap_SellingGeneralAndAdministrativeExpense 67,477us-gaap_SellingGeneralAndAdministrativeExpense 35,363us-gaap_SellingGeneralAndAdministrativeExpense  
Income tax expense                 18,308us-gaap_IncomeTaxExpenseBenefit 3,131us-gaap_IncomeTaxExpenseBenefit 8,910us-gaap_IncomeTaxExpenseBenefit  
Net income (loss) 61,849us-gaap_NetIncomeLoss [1] 50,405us-gaap_NetIncomeLoss [2] 20,344us-gaap_NetIncomeLoss [3] (20,104)us-gaap_NetIncomeLoss [4] (9,675)us-gaap_NetIncomeLoss [5] (9,507)us-gaap_NetIncomeLoss [6] (29,384)us-gaap_NetIncomeLoss [7] 8,253us-gaap_NetIncomeLoss [8] 112,494us-gaap_NetIncomeLoss (40,313)us-gaap_NetIncomeLoss (35,610)us-gaap_NetIncomeLoss  
Defined benefit plan liabilities [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance, Accumulated Other Comprehensive Loss (115,852)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		       (77,921)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		       (115,852)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other comprehensive income (loss) before reclassifications                 (42,926)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 56,795us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (16,691)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Net amount reclassified to net income (loss)                 4,995us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Elimination of equity in investee resulting from acquisition                 0cenx_EliminationOfEquityInInvestee
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Equity in investee other comprehensive income [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance, Accumulated Other Comprehensive Loss 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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= cenx_AccumulatedEquityInInvesteeAdjustmentMember		       (12,232)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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= cenx_AccumulatedEquityInInvesteeAdjustmentMember		       0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other comprehensive income (loss) before reclassifications                 (419)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Net amount reclassified to net income (loss)                 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Elimination of equity in investee resulting from acquisition                 12,651cenx_EliminationOfEquityInInvestee
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Unrealized loss on financial instruments [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Balance, Accumulated Other Comprehensive Loss (1,830)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other comprehensive income (loss) before reclassifications                 0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Net amount reclassified to net income (loss)                 (151)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Elimination of equity in investee resulting from acquisition                 0cenx_EliminationOfEquityInInvestee
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Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan liabilities [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Cost of goods sold                 6,237us-gaap_CostOfGoodsSold
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Income tax expense                 (1,811)us-gaap_IncomeTaxExpenseBenefit
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Net income (loss)                 4,995us-gaap_NetIncomeLoss
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[1] The fourth quarter of 2014 net income included a benefit of $7,943 for the gain on remeasurement of contingent consideration and a benefit of $1,318 for gain on remeasurement of our equity investment in Mt. Holly. Results were negatively impacted by $4,964 in non-cash, non-recurring pension charges and by $2,616 related to the separation of former senior executives.
[2] The third quarter of 2014 net income reflects higher aluminum prices and lower power prices in the Midwestern U.S.
[3] The second quarter of 2014 net income reflects higher aluminum prices and lower power prices in the Midwestern U.S. Results were negatively impacted by a charge of $500 for the finalization of a legal settlement.
[4] The first quarter of 2014 cost of sales included a benefit of $5,534 related to deferred power contract liability amortization. Results were negatively impacted by a $3,100 charge for increased legal reserves.
[5] The fourth quarter of 2013 cost of sales included a benefit of $16,570 related to deferred power contract liability amortization. During the quarter, inventory that had previously been written down to its market basis was consumed into cost of goods sold and inventory at the end of the quarter was written down to its market basis. The net impact of these valuation adjustments on costs of goods sold was a credit of $9,040. The financial results also include an $8,400 charge relating to the separation of our former CEO.
[6] The third quarter of 2013 cost of sales included an $11,720 benefit for deferred power contract liability amortization. During the quarter, inventory that had previously been written down to its market basis was consumed into cost of goods sold and inventory at the end of the quarter was written down to its market basis. The net impact of these valuation adjustments on costs of goods sold was a credit of $5,762.
[7] The second quarter of 2013 amounts differ from our reported second quarter results due to purchase price accounting adjustments related to the Sebree acquisition which were retroactively applied to the second quarter of 2013. The second quarter of 2013 net loss included a gain on bargain purchase of $5,253 and power contract amortization of $2,741 associated with the Sebree acquisition. Results were negatively impacted by a charge of $3,272 for the early extinguishment of our 8.0% Notes and a charge for severance and other expenses of $1,750 related to our corporate headquarters relocation. During the quarter, inventory that had previously been written down to its market basis was consumed into cost of goods sold and inventory at the end of the quarter was written down to its market basis. The net impact of these valuation adjustments on costs of goods sold was a charge of $10,211.
[8] The first quarter of 2013 net income included a net benefit of $2,225 related to a litigation reserve adjustment and an unrealized gain of $15,722 related to a LME-based contingent obligation. Results were negatively impacted by severance and other expenses of $2,213 related to our corporate headquarters relocation. The net effect of reporting inventory on a lower of cost or market basis was a charge to cost of goods sold of $5,838 in the quarter.