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ASSET RETIREMENT OBLIGATIONS (Tables)
9 Months Ended
Sep. 30, 2021
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations A roll-forward of the Company's asset retirement obligation is as follows (in thousands):
Amount
Beginning balance as of December 31, 2020
$28,699 
Liabilities settled (3,885)
Additions24,658 
Accretion expense1,290 
Ending balance as of September 30, 2021
$50,762