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REMEDIAL LIABILITIES (Tables)
 6 Months Ended
Jun. 30, 2020
Environmental Remediation Obligations [Abstract]  
Schedule of Changes to Remedial Liabilities
The changes to remedial liabilities from January 1, 2020 through June 30, 2020 were as follows (in thousands):
Remedial
Liabilities for
Landfill Sites		Remedial
Liabilities for
Inactive Sites		Remedial
Liabilities
(Including
Superfund) for
Non-Landfill
Operations		Total
Balance at January 1, 2020$1,851  $61,991  $50,331  $114,173  
Accretion44  1,265  842  2,151  
Changes in estimates recorded to statement of operations(14) (330) 1,484  1,140  
Expenditures(30) (2,171) (2,158) (4,359) 
Currency translation and other—  (923) 301  (622) 
Balance at June 30, 2020$1,851  $59,832  $50,800  $112,483