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Property, Plant and Equipment - Schedule of 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
Oil And Gas Property [Abstract]          
Asset retirement obligations     $ 369,478    
Fair value of asset retirement obligations acquired     40,078    
Obligations settled     (34,502)    
Fair value of asset retirement obligations divested     (185)    
Accretion expense $ 11,537 $ 7,316 37,748 $ 26,868  
Obligations incurred     1,337    
Changes in estimate     17,182    
Asset retirement obligations 431,136   431,136    
Less: Current portion (53,976)   (53,976)   $ (61,051)
Long-term portion $ 377,160   $ 377,160   $ 308,427