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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 6 Months Ended
Jun. 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 June 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 obligations1,080  —  1,080  
Accretion1,521  1,655  3,176  
Changes in estimates recorded to statement of operations4,503  (36) 4,467  
Changes in estimates recorded to balance sheet129  (53) 76  
Expenditures(1,254) (491) (1,745) 
Currency translation and other(249) (80) (329) 
Balance at June 30, 2020$45,131  $37,510  $82,641