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Investment in American Shale Oil, LLC (Details) - USD ($)
$ in Thousands
12 Months Ended
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)