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Investment in American Shale Oil, LLC (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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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)

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