Income Taxes (Details 1) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 17,705	$ 21,810	$ 16,641
Percentage depletion carryforward	10,206	8,645	7,317
Alternative minimum tax credits	784	784	784
Contributions carryforward and other	241	189	156
Oil and gas properties	(15,439)	(7,248)	12,575
Asset retirement obligation	20,449	18,056	10,141
Derivatives	(3,211)	408	(222)
Share-based compensation	2,560	2,887	3,474
Valuation allowance	(33,295)	(45,531)	(50,866)
Deferred taxes	$ 0us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 0us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 0us-gaap_DeferredTaxAssetsLiabilitiesNet

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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-Glossary Alternative Minimum Tax

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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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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