Income Taxes - Narrative (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Operating Loss Carryforwards [Line Items] | |||||||||||
| Income tax (benefit) expense | $ 315,815,000 | $ (144,047,000) | $ (179,331,000) | $ 0 | $ 0 | $ 0 | $ 0 | $ (69,000) | $ (7,563,000) | $ (69,000.0) | $ 1,809,000 |
| Valuation allowance increase (decrease) | (439,500,000) | 86,800,000 | 347,000,000.0 | ||||||||
| Foreign tax credit carryforwards | 943,000 | 2,009,000 | 943,000 | 2,009,000 | 2,074,000 | ||||||
| Valuation allowance of deferred tax assets | 647,575,000 | 211,987,000 | 647,575,000 | 211,987,000 | 298,830,000 | ||||||
| Impairment of oil and natural gas properties | 2,039,770,000 | 0 | $ 0 | ||||||||
| Uncertain tax position liability | 3,127,000 | $ 3,127,000 | 3,127,000 | $ 3,127,000 | |||||||
| Federal | |||||||||||
| Operating Loss Carryforwards [Line Items] | |||||||||||
| Net operating loss carryforward | 1,300,000,000 | 1,300,000,000 | |||||||||
| State | |||||||||||
| Operating Loss Carryforwards [Line Items] | |||||||||||
| Operating loss carryforwards, subject to expiration | $ 244,500,000 | $ 244,500,000 | |||||||||
| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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