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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliations of income tax rates and actual tax charge      
Net (loss) income before taxes $ (382,431) $ (172,975) $ 232,666
Net (loss) income not subject to taxes (351,773) (416,684) 550,299
Net (loss) income subject to taxes (30,658) 243,709 (317,633)
At applicable statutory tax rates (8,987) 57,737 (89,395)
Permanent and currency differences (172,368) (104,514) 109,857
Adjustments to valuation allowances and uncertain tax positions 179,675 40,863 1,623
Other 5,970 (425) 804
Tax expense (recovery) related to the current year $ 4,290 $ (6,340) $ 22,889