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REMEDIAL LIABILITIES (Tables)
 3 Months Ended
Mar. 31, 2020
Environmental Remediation Obligations [Abstract]  
Changes to remedial liabilities
The changes to remedial liabilities from January 1, 2020 through March 31, 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

Accretion
22

 
599

 
415

 
1,036

Changes in estimates recorded to statement of operations
1

 
(362
)
 
(282
)
 
(643
)
Expenditures
(15
)
 
(1,256
)
 
(1,323
)
 
(2,594
)
Currency translation and other
—

 
(43
)
 
(1,065
)
 
(1,108
)
Balance at March 31, 2020
$
1,859

 
$
60,929

 
$
48,076

 
$
110,864