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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning asset retirement obligations $ 94,194 [1] $ 114,470
Liabilities incurred [2] 3,927 4,054
Liabilities settled [3] (4,105) (33,024)
Accretion expense 4,016 4,438
Revision to estimated cash flows (11,186) 4,256
Ending asset retirement obligations [1] 86,846 94,194
Current asset retirement obligation liability $ 2,700 $ 2,300
[1]
(3) 
Balances as of December 31, 2019, and 2018, included $2.7 million and $2.3 million, respectively, related to the Company’s current asset retirement obligation liability, which is recorded in the accounts payable and accrued expenses line item on the accompanying balance sheets.
[2]
(1) 
Reflects liabilities incurred through drilling activities and acquisitions of drilled wells.
[3]
(2) 
Reflects liabilities settled through plugging and abandonment activities and divestitures of properties.