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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of pre-tax book income (loss) [Abstract]      
U.S. $ (22,865) $ 37,487 $ (114,273)
Foreign 45,104 30,059 (35,870)
Total 22,239 67,546 (150,143)
Current [Abstract]      
U.S. federal current expense (benefit) (22) 191 (22,166)
State current expense (benefit) 1,395 (1,047) (1,294)
Foreign current expense (benefit) 13,467 11,485 (2,123)
Total current expense (benefit) 14,840 10,629 (25,583)
Deferred [Abstract]      
U.S. federal expense (benefit) (5,772) (2,945) (3,024)
State deferred expense 0 (75) 677
Foreign deferred tax expense 5,291 3,524 15,573
Total deferred expense (benefit) (481) 504 13,226
Total income tax expense (benefit) 14,359 11,133 (12,357)
Reconciliation of statutory U.S. Federal income tax rate to effective income tax rate on income (loss) [Abstract]      
Federal statutory rate (in hundredths) 35.00% 35.00% 35.00%
Permanent differences (in hundredths) 38.20% (9.80%) (1.00%)
State taxes, net of Federal benefit (in hundredths) 6.30% (1.70%) 7.60%
Foreign earnings taxed at different rates than U.S. (in hundredths) (93.90%) (27.80%) 3.00%
Equity earnings in joint ventures (in hundredths) 0.00% 0.00% 1.70%
Unremitted earnings (in hundredths) 33.60% 7.30% 10.70%
Valuation allowance (in hundredths) 65.80% 22.70% (57.00%)
Changes in uncertain tax reserves (in hundredths) 5.60% (5.10%) 8.20%
Other (in hundredths) (26.00%) (4.10%) 0.00%
Effective tax rate (in hundredths) 64.60% 16.50% 8.20%
Deferred tax assets [Abstract]      
Accrued postretirement benefit cost 8,281 8,690  
Accrued liabilities 3,308 11,963  
Share-based compensation 3,758 4,169  
Derivative and hedging contracts 103,048 25,157  
Goodwill 17,551 20,760  
Equity contra - other comprehensive loss 77,142 55,810  
Capital losses 7,506 7,802  
Net operating losses 619,357 675,427  
Other 55 39  
Total deferred tax assets 840,006 809,817  
Valuation allowance (773,714) (714,423)  
Net deferred tax assets 66,292 95,394  
Deferred tax liabilities [Abstract]      
Tax over financial statement depreciation (147,021) (152,204)  
Pension (7,021) (1,311)  
Derivative and hedging contracts (10,450) 0  
Income from domestic partnership 4 3  
Unremitted foreign earnings 0 (23,560)  
Foreign basis differences (3,212) (4,321)  
Total deferred tax liabilities (157,250) (181,393)  
Net deferred tax liability (90,958) (85,999)  
Operating Loss Carryforwards [Line Items]      
Cumulative amount of foreign undistributed net earnings for which no deferred taxes have been provided 159,087    
Reconciliation of beginning and ending amounts of gross unrecognized tax benefits (excluding interest) [Roll forward]      
Balance, beginning of period 16,600 21,200 21,600
Additions based on tax positions related to the current year 2,500 4,400 5,200
Reductions based on tax positions related to the current year 0 0 0
Additions based on tax positions of prior years 0 0 0
Reductions for tax positions of prior years 0 0 (4,600)
Decreases due to lapse of applicable statute of limitations (3,200) (9,000) (700)
Settlements 0 0 (300)
Balance, end of period 15,900 16,600 21,200
Unrecognized tax positions [Abstract]      
Tax positions whose tax characterization is highly certain but for which there is uncertainty about timing of tax return inclusion 15,100 14,600 17,400
Remaining amount of unrecognized tax benefits that would affect effective tax rate if recognized 800 2,000 4,600
Unrecognized tax position balance, end of period 15,900 16,600 21,200
Interest and penalties related to unrecognized tax benefits 100 300 1,700
Federal [Member]
      
Operating Loss Carryforwards [Line Items]      
NOL carry forwards 1,447,616 [1] 1,691,172 [1]  
NOL carry forwards, expiration dates 2028 2028  
Income Tax Examination [Line Items]      
Tax years subject to examination Beginning in 2008    
State [Member]
      
Operating Loss Carryforwards [Line Items]      
NOL carry forwards 1,450,934 [2] 1,133,249 [2]  
NOL carry forwards, expiration dates 2027 2027  
Income Tax Examination [Line Items]      
Tax years subject to examination Beginning in 2005    
Icelandic [Member]
      
Operating Loss Carryforwards [Line Items]      
NOL carry forwards 298,113 [3] 185,881 [3]  
NOL carry forwards, expiration dates 2016 2016  
Income Tax Examination [Line Items]      
Tax years subject to examination Beginning in 2005    
Valuation Allowance, Operating Loss Carryforwards [Member]
      
Change in deferred tax asset valuation allowance [Abstract]      
Balance at Beginning of Period 714,423 681,094  
US operating losses 59,291 33,329  
Balance at End of Period $ 773,714 $ 714,423  
[1] The federal NOL begins to expire in 2028.
[2] The state NOL begins to expire in 2027.
[3] The Icelandic NOL begins to expire in 2016.