XML 57 R46.htm IDEA: XBRL DOCUMENT v3.21.2
ASSET RETIREMENT OBLIGATIONS (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Activity related to ARO liability  
Liability for asset retirement obligations at the beginning of the period $ 10,583
Additions 105
Accretion expense 257
Liability for asset retirement obligations at the end of the period $ 10,945