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Basis of Presentation (Details Textuals)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
$ / Barrel
Jul. 31, 2020
$ / Barrel
Jun. 30, 2020
USD ($)
$ / MMBTU
$ / Barrel
Mar. 31, 2020
USD ($)
$ / MMBTU
$ / Barrel
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]              
Average price | $ / Barrel 20            
Impairment of unevaluated costs     $ 244,900,000        
Write-down of oil and natural gas properties     662,440,000 $ 72,500,000 $ 0 $ 734,981,000 $ 0
Carrying value of long lived assets subject to impairment testing     1,300,000,000     $ 1,300,000,000  
Impairment of long-lived assets     $ 0 $ 0      
Subsequent Event              
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]              
Average price | $ / Barrel   40          
Oil              
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]              
Average price | $ / Barrel     44.74 55.17      
Natural gas              
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]              
Average price | $ / MMBTU     1.91 1.68