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CLOSURE AND POST-CLOSURE LIABILITIES
 6 Months Ended
Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
CLOSURE AND POST-CLOSURE LIABILITIES 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 June 30, 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 obligations1,342 — 1,342 
Accretion1,781 1,844 3,625 
Changes in estimates recorded to consolidated statement of operations— 300 300 
Changes in estimates recorded to consolidated balance sheet— 1,137 1,137 
Expenditures(1,163)(319)(1,482)
Currency translation and other153 42 195 
Balance at June 30, 2021$50,525 $42,969 $93,494 
In the six months ended June 30, 2021, there were no significant charges (benefits) resulting from changes in estimates for closure and post-closure liabilities.
New asset retirement obligations incurred during the first six months of 2021 were discounted at the credit-adjusted risk-free rate of 4.84%.