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Composition of certain balance sheet accounts at December 31 (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Components of Prepaid and other current assets:    
Income/withholding tax receivable - current $ 18,559 $ 95
Prepaid and other assets 14,209 10,774
Derivative assets 3,998 2,864
VAT receivable 3,880 4,559
Total prepaid and other current assets 40,646 18,292
Components of Other assets:    
Investment in Mt. Holly and joint ventures 40,922 37,570
Maintenance and operating supplies - non-current 17,887 17,986
Cash surrender value of life insurance policies 16,286 14,365
Rabbi trust assets 14,616 0
Income tax receivables - non-current 12,103 9,127
Capitalized financing fees 2,735 3,906
Total other assets 104,549 82,954
Components of Accrued and other current liabilities:    
Other accrued and current liabilities 18,838 20,510
Income taxes payable 13,370 11,201
Accrued vacation pay 5,922 5,259
Accrued bond interest 2,560 2,903
Accrued curtailment expenses 86 1,622
Total accrued and other liabilities 40,776 41,495
Components of Other liabilities:    
E.ON contingent liability and accrued interest 13,958 13,091
Asset retirement obligations - non-current 13,887 13,059
Accrued workers' compensation cost - non-current 7,210 6,985
Other liabilities 4,950 4,477
Total other liabiliies 40,005 37,612
Components of Accumulated Other Comprehensive Loss:    
Unrealized loss on financial instruments (1,040) (415)
Defined benefit plan liabilities (142,259) (64,296)
Equity in investee other comprehensive income (8,476) [1] (8,223) [1]
Other comprehensive loss before income tax effect (151,775) (72,934)
Income tax effect 17,187 22,958
Accumulated other comprehensive loss $ (134,588) $ (49,976)
[1] The amount includes our equity in the other comprehensive income of Mt. Holly Aluminum Company.