Income Taxes (Details 1) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 16,641	$ 2,409	$ 4,737
Percentage depletion carryforward	7,317	6,103	3,596
Alternative minimum tax credit's	784	784	776
Contributions carryforward and other	156	130	90
Oil and gas properties—full cost	22,716	(10,541)	(10,141)
Derivatives	(222)	(2,388)	405
Share-based compensation	3,474	2,952	3,732
Valuation allowance	(50,866)	0	(3,195)
Deferred tax liability	$ 0	$ (551)	$ 0

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