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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

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Amount computed using standard rate of corporate tax.

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The consolidated profit or loss for the period before income taxes, including the portion attributable to the noncontrolling interest.

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Net income (loss) not subject to taxes.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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