XML 43 R27.htm IDEA: XBRL DOCUMENT v3.21.2
ASSET RETIREMENT OBLIGATIONS (Tables)
6 Months Ended
Jun. 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 (2,902)
Additions24,633 
Accretion expense764 
Ending balance as of June 30, 2021
$51,194