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Investment in American Shale Oil, LLC (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary in the change in balance of the Company's investment in AMSO, LLC |  |  |
Balance, beginning of period | $ (252) | $ (252) | $ 242
Capital contributions | 250 |  | 2,700
Equity in net loss of AMSO, LLC | (397) |  | (3,194)
Balance, end of period | $ (399) | $ (252) | $ (252)

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