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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis          
Balance at beginning of period     $ 127,251    
Obligations incurred with development activities     7,588    
Accretion expense $ 2,420 $ 1,356 7,398 $ 4,503  
Obligations discharged asset retirements     (25,545)    
Balance end of period 163,704   163,704    
Less current portion (30,348)   (30,348)    
Asset retirement obligations $ 133,356   133,356   $ 95,051
Asset Retirement Obligation, Revision of Estimate     (146)    
SRC [Domain]          
Asset Retirement Obligation, Roll Forward Analysis          
Obligations incurred with development activities     $ 47,158