Investment in American Shale Oil, LLC (Details 2) (AMSO, LLC [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
AMSO, LLC [Member]
ASSETS
Cash and cash equivalents	$ 883	$ 2,171
Other current assets	141	69
Equipment, net	36	53
Other assets		805
TOTAL ASSETS	1,060	3,098
LIABILITIES AND MEMBERS' INTERESTS
Current liabilities	1,024	1,649
Other liabilities	644	644
Members' interests	(608)	805
TOTAL LIABILITIES AND MEMBERS' INTERESTS	$ 1,060	$ 3,098