Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Oil and gas properties
Accumulated depreciation, depletion, amortization and impairment	$ (57,723)	$ (40,502)
Net oil and gas properties	35,549	50,259
Accumulated depreciation and amortization	(489)	(441)
Net other property and equipment	286	287
Total property and equipment	35,835	50,546
Proved Oil and Gas Properties [Member]
Oil and gas properties
Oil and gas properties, gross	91,754	89,392
Unproved Properties Not Subject To Depletion [Member]
Oil and gas properties
Oil and gas properties, gross	1,518	1,369
Furniture and Fixtures Computer Hardware and Software and Other Equipment [Member]
Oil and gas properties
Other property and equipment, gross	$ 775	$ 728