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Property, Plant and Equipment - Schedule of Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oil And Gas Property [Abstract]      
Asset retirement obligations $ 369,478 $ 382,817  
Fair value of asset retirement obligations acquired 44,311 5,047  
Obligations settled (43,933) (75,331)  
Fair value of asset retirement obligations divested (185) (5,450)  
Accretion expense 49,741 34,389 $ 35,344
Obligations incurred 4,511 4,111  
Changes in estimate 18,346 23,895  
Asset retirement obligations 442,269 369,478 $ 382,817
Less: Current portion (49,921) (61,051)  
Long-term portion $ 392,348 $ 308,427