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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 3 Months Ended
Mar. 31, 2021
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, 2021 through March 31, 2021 were as follows (in thousands):
Landfill
Retirement
Liability		Non-Landfill
Retirement
Liability		Total
Balance at January 1, 2021$48,412 $39,514 $87,926 
Liabilities assumed in acquisitions— 451 451 
New asset retirement obligations646 — 646 
Accretion955 908 1,863 
Changes in estimates recorded to consolidated statement of operations— 29 29 
Changes in estimates recorded to consolidated balance sheet— 1,045 1,045 
Expenditures(751)(178)(929)
Currency translation and other65 9 74 
Balance at March 31, 2021$49,327 $41,778 $91,105