Discontinued Operations - Discontinued Oil and Gas Operations - Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Liabilities:
Trade payables	$ 2	$ 3
Revenues and royalties payable	18	18
Accrued commitments and contingencies	2,390	3,165
Accrued liabilities and other	112	51
Total Current Liabilities	2,522	3,237
Total Liabilities of Discontinued Operations	$ 2,522	$ 3,237