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Acquisitions (Consolidated Results Of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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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