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ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Changes in the Company's asset retirement obligations          
Beginning asset retirement obligations     $ 38,542    
Liabilities incurred during period     635    
Liabilities settled during period     (240)    
Accretion expense $ 511 $ 495 1,011 $ 971  
Ending asset retirement obligations 39,948   39,948    
Less: current asset retirement obligations [1] (211)   (211)    
Long-term asset retirement obligations $ 39,737   $ 39,737   $ 37,919
[1] Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2021.