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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 6 Months Ended
Jun. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Closure and Post-Closure Liabilities
The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2023 through June 30, 2023 were as follows (in thousands):
Landfill
Retirement
Liability		Non-Landfill
Retirement
Liability		Total
Balance at January 1, 2023$62,251 $56,550 $118,801 
Liabilities assumed in acquisitions— 584 584 
Measurement period adjustments from prior period acquisitions— 3,015 3,015 
New asset retirement obligations1,348 — 1,348 
Accretion2,555 2,182 4,737 
Changes in estimates recorded to consolidated statement of operations— 135 135 
Changes in estimates recorded to consolidated balance sheet(260)1,531 1,271 
Expenditures(5,408)(4,093)(9,501)
Currency translation and other169 149 318 
Balance at June 30, 2023$60,655 $60,053 $120,708