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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Changes in the Company's asset retirement obligations          
Beginning asset retirement obligations     $ 31,086    
Liabilities incurred during period     1,427    
Liabilities settled during period     (154)    
Divestitures during period     (951)    
Accretion expense $ 420 $ 375 834 $ 739  
Ending asset retirement obligations 32,242   32,242    
Less: current asset retirement obligations [1] (1,556)   (1,556)    
Long-term asset retirement obligations $ 30,686   $ 30,686   $ 29,736
[1]
Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2019.