Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 92,072	$ 51,519
Percentage depletion carryforward	9,372	10,592
Alternative minimum tax credits	784	784
Contributions carryforward and other	282	266
Oil and gas properties	27,992	62,786
Asset retirement obligation	13,620	15,831
Derivatives	1,767	(561)
Share-based compensation	1,870	2,291
Original issue discount on debt exchanges	29,646	0
Valuation allowance	(177,405)	(143,508)
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, 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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