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Income Tax (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliations of the tax charge      
Net income before income tax expense $ 98,137 $ 94,614 $ 82,631
Net (income) loss not subject to taxes (205,363) (138,951) 7,563
Net (loss) income subject to taxes (107,226) (44,337) 90,194
At applicable statutory tax rates      
Amount computed using the standard rate of corporate tax (30,548) (14,115) 25,089
Adjustments to valuation allowances and uncertain tax position 25,361 19,980 (25,704)
Permanent and currency differences (2,540) (4,195) 1,309
Change in tax rate 8,508 0 0
Tax expense charge related to the current year $ 781 $ 1,670 $ 694