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Property, Plant and Equipment - Schedule of Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oil And Gas Property [Abstract]      
Asset retirement obligations $ 382,817 $ 214,733  
Fair value of asset retirement obligations acquired 5,047 244,766  
Obligations settled (75,331) (112,946)  
Fair value of asset retirement obligations divested (5,450)    
Accretion expense 34,389 35,344 $ 19,295
Obligations incurred 4,111 358  
Changes in estimate 23,895 562  
Asset retirement obligations 369,478 382,817 $ 214,733
Less: Current portion (61,051) (68,965)  
Long-term portion $ 308,427 $ 313,852