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REMEDIAL LIABILITIES (Tables)
 3 Months Ended
Mar. 31, 2018
Environmental Remediation Obligations [Abstract]  
Changes to remedial liabilities
The changes to remedial liabilities for the three months ended March 31, 2018 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, 2018
$
1,800

 
$
65,342

 
$
57,326

 
$
124,468

Accretion
21

 
672

 
472

 
1,165

Changes in estimates recorded to statement of operations
—

 
(24
)
 
(568
)
 
(592
)
Expenditures
(12
)
 
(826
)
 
(1,370
)
 
(2,208
)
Currency translation and other
—

 
(9
)
 
(377
)
 
(386
)
Balance at March 31, 2018
$
1,809

 
$
65,155

 
$
55,483

 
$
122,447