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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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