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Acquisitions (Consolidated Results Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Business Acquisition [Line Items]
Revenues, Actual	$ 330,422	$ 128,927	$ 37,755
Net Loss, Actual	79,390	(29,695)	(15,209)
Kerogen Acquisition [Member]
Business Acquisition [Line Items]
Revenues, Actual			37,755
Revenues, Pro Forma			41,999
Net Loss, Actual			(15,209)
Net Loss, Pro Forma			(15,461)
Fidelity Acquisition [Member]
Business Acquisition [Line Items]
Revenues, Actual			37,755
Revenues, Pro Forma			40,934
Net Loss, Actual			(15,209)
Net Loss, Pro Forma			$ (15,872)

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