Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 78,541	$ 92,072
Percentage depletion carryforward	5,701	9,372
Alternative minimum tax credits	0	784
Contributions carryforward and other	192	282
Oil and gas properties	8,279	27,992
Asset retirement obligation	7,602	13,620
Derivatives	(107)
Deferred Tax Assets, Derivative Instruments		1,767
Share-based compensation	1,269	1,870
Original issue discount on debt exchanges	14,429	29,646
Valuation allowance	(115,906)	(177,405)
Deferred tax asset (liability)	$ 0	$ 0

Deferred Tax Assets, Asset Retirement Obligation

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Deferred Tax Assets, Percentage Depletion Carryforward

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Deferred Tax Assets, Tax Basis Discount On Debt Restructuring

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

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without 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 allowance, of deferred tax asset attributable to deductible tax carryforwards, classified as other.

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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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Amount of deferred tax liability attributable to taxable temporary differences from derivatives.

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