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Debt (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Debt Instrument [Line Items] |  |  |  |  |
Debt | $ 271,285 |  | $ 314,919 |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
2012 | 0 |  |  |  |
2013 | 0 |  |  |  |
2014 | 0 |  |  |  |
2015 | 252,207 |  |  |  |
Total | 252,207 |  |  |  |
Convertible senior notes due 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (in hundredths) | 1.75% |  |  |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
Aggregate principal amount outstanding | 0 |  | 45,483 |  |
Maturity date | Aug. 31, 2024 |  |  |  |
Senior secured notes due May 15, 2014 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (in hundredths) | 8.00% |  |  |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
Aggregate principal amount outstanding | 246,909 |  | 245,927 |  |
Maturity date | May 15, 2014 |  |  |  |
Senior unsecured notes due August 15, 2014 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (in hundredths) | 7.50% |  |  |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
Aggregate principal amount outstanding | 2,603 |  | 2,603 |  |
Maturity date | Aug. 15, 2014 |  |  |  |
Line of Credit [Member] |  |  |  |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
Maximum amount of debt available to borrow | 100,000 |  |  |  |
Letter of credit sub-facility included in the credit facility | 50,000 |  |  |  |
Borrowing availability on the credit facility | 57,473 |  |  |  |
Net of outstanding letters of credit under the credit facility | 41,451 |  |  |  |
Interest Rates and Fees | Any amounts outstanding under the Credit Facility will bear interest, at our option, at LIBOR or a base rate, plus, in each case, an applicable interest margin. The applicable interest margin is determined based on the average daily availability for the immediately preceding quarter. For amounts outstanding under the revolving credit facility, the applicable interest margin ranges from 2.50 to 3.00 over the LIBOR rate and 1.50 under to 2.00 over the base rate. |  |  |  |
Line of credit facility interest rate margin added to LIBOR, minimum (in hundredths) | 2.50% |  |  |  |
Line of credit facility interest rate margin added to LIBOR, maximum (in hundredths) | 3.00% |  |  |  |
Line of credit facility interest rate margin deducted from base rate, maximum (in hundredths) | 1.50% |  |  |  |
Line of credit facility interest rate margin added to base rate, maximum (in hundredths) | 2.00% |  |  |  |
Commitment fee | 0.50% |  |  |  |
Standby letters of credit commitment fee with 100% supported by cash collateral (in hundredths) | 0.75% |  |  |  |
Standby letters of credit commitment fee with less than 100% supported by cash collateral (in hundredths) | 2.50% |  |  |  |
Maturity date | Jul. 01, 2014 |  |  |  |
Current [Member] | Convertible senior notes due 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 0 | [1] | 45,483 | [1] |
Net of debt discount | 0 |  | 1,584 |  |
Interest rate (in hundredths) | 1.75% |  | 1.75% |  |
Interest expense on the convertible senior notes [Abstract] |  |  |  |  |
Contractual interest coupon | 316 |  | 823 |  | 2,585
Amortization of the debt discount on the liability component | 874 |  | 2,244 |  | 6,969
Total | 1,190 |  | 3,067 |  | 9,554
Effective interest rate for the liability component for the period | 6.74% |  | 6.52% |  | 6.34%
Current [Member] | Industrial revenue bonds due 2028 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 7,815 | [1] | 7,815 | [1] |
Interest rate (in hundredths) | 0.35% |  |  |  |
Variable interest rates, maximum (in hundredths) | 12.00% |  | 12.00% |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
Maturity date | Apr. 01, 2028 |  |  |  |
Long-Term [Member] | Senior secured notes due May 15, 2014 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 246,909 |  | 245,927 |  |
Net of debt discount | 2,695 |  | 3,677 |  |
Interest rate (in hundredths) | 8.00% |  | 8.00% |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
2012 | 0 |  |  |  |
2013 | 0 |  |  |  |
2014 | 0 |  |  |  |
2015 | 249,604 |  |  |  |
Total | 249,604 |  |  |  |
Proceeds from issuance of debt | 249,604 |  |  |  |
Maturity date | May 15, 2014 |  |  |  |
Redemptions rights as a percentage of price (in hundredths) | 104.00% |  |  |  |
After a change of control, required offer to purchase price percentage of principal outstanding (in hundredths) | 101.00% |  |  |  |
Redemption price will decline to (in hundredths) | 102.00% |  |  |  |
Date redemption price will decline | May 15, 2012 |  |  |  |
Redemption price will decline after May 15, 2013 (in hundredths) | 100.00% |  |  |  |
Date redemption price will decline to 100% | May 15, 2013 |  |  |  |
Percentage of equity interests in foreign subsidiaries held for collateral (in hundredths) | 65.00% |  |  |  |
Long-Term [Member] | Senior unsecured notes due August 15, 2014 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 2,603 |  | 2,603 |  |
Interest rate (in hundredths) | 7.50% |  | 7.50% |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
2012 | 0 |  |  |  |
2013 | 0 |  |  |  |
2014 | 0 |  |  |  |
2015 | 2,603 |  |  |  |
Total | 2,603 |  |  |  |
Proceeds from issuance of debt | 250,000 |  |  |  |
Issuance date of debt instrument | Aug. 01, 2004 |  |  |  |
Maturity date | Aug. 15, 2014 |  |  |  |
Redemptions rights as a percentage of price (in hundredths) | 101.50% |  |  |  |
After a change of control, required offer to purchase price percentage of principal outstanding (in hundredths) | 101.00% |  |  |  |
Long-Term [Member] | Contingent obligation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | $ 13,958 |  | $ 13,091 | [2] |
Interest rate (in hundredths) | 10.94% |  | 10.94% |  |
Maximum time period to pay principal and interest (in months) | 72 |  | 72 |  |
Principal payments for the next five years and thereafter [Abstract] |  |  |  |  |
Maturity date | Dec. 31, 2028 |  |  |  |
[1] | The convertible notes are classified as current because they are convertible at any time by the holder. The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at December 31, 2010 was 0.64%.
[2] | E.ON contingent obligation principal and interest payments are payable based on CAKY's operating level and the LME price for primary aluminum. When both conditions are satisfied, we are obligated to pay principal and interest, in up to 72 monthly payments, to E.ON. Interest accrues monthly at an annual rate of 10.94%. The E.ON contingent obligation amount is included in other liabilities on our consolidated balance sheets.

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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