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Acquisitions and Dispositions Acquisitions and Dispositions (Details) - USD ($)
$ in Thousands
9 Months Ended
May 13, 2020
Apr. 03, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 22, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Payments for (Proceeds from) Other Investing Activities     $ 426 $ 4,402  
Acquisition of oil and gas properties     3,441 0  
Bay De Chene [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Purchase and sale contract         $ 16,300
Payments for (Proceeds from) Other Investing Activities     400 $ 4,400  
Cash to be released for purchase and sale contract     $ 2,000    
Eagle Ford Acquisition [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Acquisition of oil and gas properties   $ 5,000      
Wyoming Disposition [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from Sale of Oil and Gas Property and Equipment $ 4,800