Income Taxes (Details 1) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 24,014	$ 17,705	$ 21,810
Percentage depletion carryforward	10,592	10,206	8,645
Alternative minimum tax credits	784	784	784
Contributions carryforward and other	266	241	189
Oil and gas properties	90,291	(15,439)	(7,248)
Asset retirement obligation	15,831	20,449	18,056
Derivatives	(561)	(3,211)	408
Share-based compensation	2,291	2,560	2,887
Valuation allowance	(143,508)	(33,295)	(45,531)
Deferred taxes	$ 0	$ 0	$ 0

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 and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting.

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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 other deductible tax carryforwards not separately disclosed.

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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 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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