Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Schedule of Asset Retirement Obligation (Details)

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Property and Equipment - Schedule of Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligation, beginning of period $ 79,952 $ 75,100  
Liabilities incurred 5,935 1,827  
Liabilities settled (273) (719)  
Liabilities removed due to divestitures (30,146) 0 $ 0
Accretion expense 3,939 4,119 1,611
Revisions in estimated cash flows 948 (375)  
Asset retirement obligation as of end of period $ 60,355 $ 79,952 $ 75,100