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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of operating results of discontinued operations
Revenues	$ 0	$ 2,940	$ 69,050
Expenses and selling, general and administrative	1,302	5,892	61,761
Loss (recovery) attributable to expropriation	3,092	(38,925)	329,685
Other (income) loss, net	(150)	(12,145)	(7,571)
Provision for (benefit from) income taxes	1,719	2,795	(18,586)
Income (loss) from discontinued operations, net of tax	$ (5,963)	$ 45,323	$ (296,239)

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Other pretax income (loss) amounts relating to a disposal group that is classified as a component of the entity, exclusive of the following elsewhere enumerated categories: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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