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Investment in American Shale Oil, LLC (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Summary in the change in balance of the Company's investment in AMSO, LLC
Balance, beginning of period			$ 242	$ (685)
Capital contributions			2,345	2,925
Equity in the net loss of AMSO, LLC	(672)	(508)	(2,607)	(2,252)
Balance, end of period	$ (20)	$ (12)	$ (20)	$ (12)

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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