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Subsequent events	6 Months Ended
Subsequent events	Jun. 30, 2014
Subsequent Events [Abstract]
Subsequent events	Subsequent events We have evaluated all subsequent events through the date the financial statements were issued. Sebree enters into a new collective bargaining agreement In July 2014, Century Sebree entered into a new collective bargaining agreement with the USWA for its employees at the Sebree smelter. The agreement is effective through October 28, 2019. Century reaches a settlement in three Vialco lawsuits In July 2014, we entered into a settlement with respect to certain matters related to the St. Croix Alumina Refinery. See Note 10 Commitments and contingencies - "Matters relating to the St. Croix Alumina Refining Facility" for additional information about the settlement. Century finalizes the Sebree acquisition working capital adjustment In July 2014, we reached a final determination of the applicable working capital adjustments for the Sebree acquisition. As a result, we recognized a gain, recorded in other income (expense) - net, of approximately $965 from the release of accrued amounts related to the acquisition. HS Orka seeks arbitration regarding its Helguvik power contract On July 10, 2014, HS Orka ehf, one of the contracted power suppliers to Helguvik, commenced arbitration proceedings against Nordural Helguvik seeking, among other things, an order declaring (i) that the conditions to the power contract have not been fulfilled and (ii) that the power contract is therefore no longer valid. Nordural Helguvik believes HS’ renewed claims are without merit and intends to defend itself against them.