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Basis of Presentation and Significant Accounting Policies - Narrative (Details) | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) facility | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Capitalized interest |  |  | $ 2,000,000 |  |
Capitalized exploratory well costs |  | $ 0 | 0 | $ 0 | $ 0
Net capitalized costs attributable to unproved properties | $ 531,200,000 |  | 313,903,000 | 388,034,000 |
Net capitalized costs attributable to unproved properties |  |  |  | 388,000,000 |
Impairment of oil and gas properties | $ 0 | $ 0 | 51,081,000 | 0 |
Asset retirement obligation, noncurrent, increase in timing and cost estimates |  |  | 57,000,000 |  |
Asset retirement obligation, noncurrent, increase due to new wells |  |  | 11,534,000 | 4,901,000 |
Asset retirement obligation, noncurrent, increase due to accretion expense |  |  | 7,570,000 | 6,258,000 |
Asset retirement obligation, liabilities settled |  |  | (22,036,000) | $ (3,555,000) |
Asset retirement obligation, current, increase in timing and cost estimates |  |  | $ 19,000,000 |  |
Number of cogeneration facilities | facility |  |  | 5 |  |
Largest customers | Sales | Customer one |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Concentration risk | 34.00% |  | 36.00% | 35.00% | 36.00%
Largest customers | Sales | Customer two |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Concentration risk | 29.00% |  | 24.00% | 28.00% | 29.00%
Largest customers | Sales | Customer three |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Concentration risk |  |  | 13.00% | 13.00% | 13.00%
Largest customers | Trade accounts receivable | Customer one |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Concentration risk |  |  | 40.00% | 26.00% |
Largest customers | Trade accounts receivable | Customer two |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Concentration risk |  |  | 17.00% | 22.00% |
Largest customers | Trade accounts receivable | Customer three |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Concentration risk |  |  | 11.00% | 10.00% |
Buildings and leasehold improvements | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Expected useful life |  |  | 5 years |  |
Buildings and leasehold improvements | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Expected useful life |  |  | 30 years |  |
Plant and pipeline, drilling and other equipment | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Expected useful life |  |  | 2 years |  |
Plant and pipeline, drilling and other equipment | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Expected useful life |  |  | 30 years |  |
Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Performance-based Restricted Stock Units (PSUs) | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Vesting period |  |  | 2 years |  |
Performance-based Restricted Stock Units (PSUs) | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Proved Oil and Gas Properties |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of oil and gas properties |  |  | $ 23,000,000 |  |
Unproved Oil and Gas Properties |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of oil and gas properties |  |  | $ 28,000,000 |  |

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