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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:    
Vessels and equipment $ 76,582 $ 2,182
Tax losses carried forward (1) 380,299 286,499
Other 95,312 97,945
Total deferred tax assets 552,193 386,626
Deferred tax liabilities:    
Vessels and equipment 60,776 122,263
Long-term debt 24,918 31,077
Other 45,624 2,900
Total deferred tax liabilities 131,318 156,240
Net deferred tax assets 420,875 230,386
Valuation allowance (398,559) (213,385)
Net deferred tax assets (liabilities) $ 22,316 $ 17,001