Other Long-Term Liabilities and Deferred Credits - Schedule of Other Long-Term Liabilities and Deferred Credits (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Other long-term liabilities and deferred credits	$ 950		$ 1,354
Royalties Payable [Member]
Other long-term liabilities and deferred credits	500	[1]	500	[1]
Crownpoint Property [Member]
Other long-term liabilities and deferred credits	450	[1]	450	[1]
GE Purchase Contract [Member]
Other long-term liabilities and deferred credits		[2]	$ 400	[2]

[1] Royalties payble and Crownpoint property liability were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.

[2] Balance is due on August 1, 2015 and has been reclassified to short-term accrued liabilities as of December 31, 2014.