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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Changes in the Company's asset retirement obligations      
Beginning asset retirement obligations $ 36,211    
Liabilities incurred during period 990    
Liabilities settled during period (44)    
Accretion expense 476 $ 414  
Ending asset retirement obligations 37,633    
Less: current asset retirement obligations [1] (515)    
Long-term asset retirement obligations $ 37,118   $ 35,592
[1]
Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at March 31, 2020.