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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Changes in the Company's asset retirement obligations          
Beginning asset retirement obligations     $ 36,211    
Liabilities incurred during period     2,245    
Liabilities settled during period     (212)    
Revisions in estimated cash flows     (1,875)    
Accretion expense $ 478 $ 520 1,449 $ 1,354  
Ending asset retirement obligations 37,818   37,818    
Less: current asset retirement obligations [1] (596)   (596)    
Long-term asset retirement obligations $ 37,222   $ 37,222   $ 35,592
[1] Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at September 30, 2020.