Discontinued Operations - Discontinued Oil and Gas Operations - Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Liabilities:
Trade payables	$ 3	$ 3
Revenues and royalties payable	23	18
Accrued commitments and contingencies	1,615	3,165
Accrued liabilities and other	76	51
Total Current Liabilities	1,717	3,237
Total Liabilities of Discontinued Operations	$ 1,717	$ 3,237