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ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning balance $ 172,230 $ 133,904
Obligations incurred 6,325 5,230
Revision in estimates 0 8,477
Accretion expense 10,942 8,569
Obligations settled (5,960) (6,545)
Ending balance $ 183,537 $ 149,635