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Quarterly Information (Unaudited) 2013 Financial Results Overview (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 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
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |
Sebree power contract amortization |  |  | $ 5,534 cenx_AmortizationofAssumedPowerContract | $ 16,570 cenx_AmortizationofAssumedPowerContract | $ 11,720 cenx_AmortizationofAssumedPowerContract | $ 2,741 cenx_AmortizationofAssumedPowerContract |  | $ 5,534 cenx_AmortizationofAssumedPowerContract | $ 31,031 cenx_AmortizationofAssumedPowerContract | $ 0 cenx_AmortizationofAssumedPowerContract
Lower of cost or market inventory adjustments |  |  |  | 9,040 us-gaap_InventoryAdjustments | 5,762 us-gaap_InventoryAdjustments | 10,211 us-gaap_InventoryAdjustments | 5,838 us-gaap_InventoryAdjustments |  | 9,040 us-gaap_InventoryAdjustments |
Litigation settlement expense | 2,616 us-gaap_LitigationSettlementExpense | 500 us-gaap_LitigationSettlementExpense |  | 8,400 us-gaap_LitigationSettlementExpense |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | 3,272 us-gaap_GainsLossesOnExtinguishmentOfDebt |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (3,272)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt
Relocation expense |  |  |  |  |  | 1,750 cenx_Relocationexpense | 2,213 cenx_Relocationexpense |  |  |
Increase (Decrease) in litigation reserve |  |  | 3,100 us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve |  |  |  | 2,225 us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve |  |  |
Unrealized gain (loss) on E.ON obligation |  |  |  |  |  |  | 15,722 cenx_UnrealizedGainLossOnEOnObligation | 1,412 cenx_UnrealizedGainLossOnEOnObligation | 16,781 cenx_UnrealizedGainLossOnEOnObligation | 0 cenx_UnrealizedGainLossOnEOnObligation
Gain on bargain purchase |  |  |  |  |  | $ 5,253 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  | $ 0 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount | $ 5,253 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount | $ 0 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount

X
- Definition The aggregate benefit recognized in earnings to allocate the assumed power contract liability in a systematic and rational manner over the contract period. As a noncash benefit, this element is subtracted from net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
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X
- Definition Severance and other expenses of related to the relocation of corporate headquarters + References No definition available. + Details
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X
- Definition The net change in the difference between the fair value and the carrying value on the contingent obligation held at each balance sheet date, that was included in earnings for the period. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The increase (decrease) during the reporting period in the reserve account established to account for expected but unspecified losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Certain changes made in the current period to the value and amount of inventory reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph b -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360613&loc=d3e4492-108314 + Details
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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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