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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 through September 30, 2020 were as follows (in thousands):
Landfill
Retirement
Liability		Non-Landfill
Retirement
Liability		Total
Balance at January 1, 2020$39,401 $36,250 $75,651 
Liabilities assumed in acquisitions— 265 265 
New asset retirement obligations1,643 — 1,643 
Accretion2,373 2,516 4,889 
Changes in estimates recorded to statement of operations4,503 (14)4,489 
Changes in estimates recorded to balance sheet179 15 194 
Expenditures(2,116)(622)(2,738)
Currency translation and other(133)(44)(177)
Balance at September 30, 2020$45,850 $38,366 $84,216