Supplemental Quarterly Financial Information (Unaudited) (Additional Information) (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Gain (loss) on derivatives | $ (125,700,000) | $ (27,000,000.0) | $ (127,000,000.0) | $ 252,000,000.0 | $ (30,700,000) | $ 21,800,000 | $ 14,000,000.0 | $ (67,300,000) | $ (27,773,000) | $ (62,109,000) | $ 48,544,000 |
| Merger and integration expenses | 1,600,000 | 2,500,000 | 8,100,000 | $ 15,800,000 | 68,400,000 | 5,900,000 | 28,482,000 | 74,363,000 | 0 | ||
| Impairment of evaluated oil and gas properties | 585,800,000 | $ 685,000,000.0 | $ 1,300,000,000 | 2,547,241,000 | 0 | 0 | |||||
| (Gain) loss on early extinguishment of debt | $ (170,400,000) | $ 4,900,000 | (170,370,000) | 4,881,000 | 0 | ||||||
| Loss on redemption of preferred stock | $ 8,300,000 | $ 0 | $ 8,304,000 | $ 0 | |||||||
| X | ||||||||||
- Definition Non-Cash Gains Losses On Early Extinguishment Of Debt No definition available.
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| X | ||||||||||
- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. No definition available.
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| X | ||||||||||
- 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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| X | ||||||||||
- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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