Income Taxes (Details 1) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 21,810	$ 16,641	$ 2,409
Percentage depletion carryforward	8,645	7,317	6,103
Alternative minimum tax credits	784	784	784
Contributions carryforward and other	189	156	130
Oil and gas properties	(7,248)	12,575	(21,860)
Asset retirement obligation	18,056	10,141	11,319
Derivatives	408	(222)	(2,388)
Share-based compensation	2,887	3,474	2,952
Valuation allowance	(45,531)	(50,866)	0
Deferred tax liability	$ 0	$ 0	$ (551)

Deferred Tax Assets, Asset Retirement Obligation

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Deferred Tax Assets, Percentage Depletion Carryforward

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from hedging transactions.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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