Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 86,046	$ 78,541
Percentage depletion carryforward	6,011	5,701
Interest expense carryforward	10,540	0
Contributions carryforward and other	194	192
Oil and gas properties	3,673	8,279
Asset retirement obligation	602	7,602
Derivatives	0	(107)
Share-based compensation	1,403	1,269
Original issue discount on debt exchanges	9,815	14,429
Other	432	0
Valuation allowance	(118,716)	(115,906)
Deferred tax asset (liability)	$ 0	$ 0

Deferred Tax Assets, Asset Retirement Obligation

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Deferred Tax Assets, Interest Expense Carryforwards

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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 temporary differences, 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 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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