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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)