Acquisitions and Divestitures (Details) - USD ($) $ in Thousands	1 Months Ended		2 Months Ended	3 Months Ended
	Feb. 08, 2019	Oct. 31, 2018	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Jan. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities related to oil and gas properties sold			$ 0
Gulf Of Mexico Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities related to oil and gas properties sold				$ 28,200
Predecessor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities related to oil and gas properties sold	$ 0				$ 28,214
Predecessor | Gulf Of Mexico Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase commitment, remaining minimum amount committed						$ 3,800
Refund receivable						$ 12,400
Payments for previous acquisition		$ 4,200