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Investment in American Shale Oil, LLC (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Summary in the change in balance of the Company's investment in AMSO, LLC
Balance, beginning of period			$ (252)	$ 242
Capital contributions				1,825
Equity in the net loss of AMSO, LLC		(806)		(1,935)
Balance, end of period	$ (252)	$ 132	$ (252)	$ 132

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