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Investment in American Shale Oil, LLC (Details) (USD $) In Thousands, unless otherwise specified	5 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2011
Summary in the change in balance of the Company's investment in AMSO, LLC
Balance, beginning of period	$ (630)	$ 665	$ 242	$ (685)	$ 665
Capital contributions	2,040	2,514	2,700	4,102	3,943
Equity in the net loss of AMSO, LLC	(2,095)	(1,658)	(3,194)	(3,175)	(5,238)
Balance, end of period	$ (685)		$ (252)	$ 242	$ (630)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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