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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Changes in the Company's asset retirement obligations          
Beginning asset retirement obligations     $ 36,211    
Liabilities incurred during period     1,463    
Liabilities settled during period     (109)    
Accretion expense $ 495 $ 420 971 $ 834  
Ending asset retirement obligations 38,536   38,536    
Less: current asset retirement obligations [1] (539)   (539)    
Long-term asset retirement obligations $ 37,997   $ 37,997   $ 35,592
[1] Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2020.