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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Changes in the Company's asset retirement obligations          
Beginning asset retirement obligations     $ 31,086    
Liabilities incurred during period     2,194    
Liabilities settled during period     (155)    
Revisions in estimated cash flows     1,792    
Divestitures during period     (2,145)    
Accretion expense $ 520 $ 387 1,354 $ 1,126  
Ending asset retirement obligations 34,126   34,126    
Less: current asset retirement obligations [1] (619)   (619)    
Long-term asset retirement obligations $ 33,507   $ 33,507   $ 29,736
[1]
Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at September 30, 2019.