Supplemental Oil and Gas Disclosures (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Results of Operations for Producing Activities Detail [Table]
Oil and gas sales revenues	$ 4,722	$ 5,560	$ 6,158
Production (lifting) costs	2,002	2,637	3,749
Depreciation, depletion, and amortization	30	37	60
Excess decommissioning and abandonment costs	73,194	75,313	40,767
Accretion expense	130	87	979
Gain on insurance recoveries	(6)	(5,685)	0
Pretax income (loss) from producing activities	(70,628)	(66,829)	(39,397)
Income tax expense (benefit)	0	(23,390)	(13,789)
Results of oil and gas producing activities	$ (70,628)	$ (43,439)	$ (25,608)