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Acquisitions and Divestitures (Details) - USD ($)
$ in Thousands
1 Months Ended 5 Months Ended 6 Months Ended
Jan. 31, 2018
Feb. 08, 2019
Oct. 31, 2018
Jun. 30, 2019
Jun. 30, 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   $ 0 $ 28,214
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        
Liabilities related to oil and gas properties sold 28,200        
Refund receivable $ 12,400        
Payments for previous acquisition     $ 4,200