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Investments in Non-Consolidated Affiliates (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summarized combined earnings information
Revenues	$ 0		$ 8,381
Operating income (loss)	31,651	41,582	(400,727)
Net income (loss)	$ 28,269	$ 43,013	$ (343,680)

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The amount of operating profit (loss) reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

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