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REMEDIAL LIABILITIES (Tables)
 9 Months Ended
Sep. 30, 2017
Environmental Remediation Obligations [Abstract]  
Changes to remedial liabilities
The changes to remedial liabilities for the nine months ended September 30, 2017 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, 2017
$
1,777

 
$
64,151

 
$
62,079

 
$
128,007

Measurement period adjustments from prior period acquisitions
—

 
—

 
504

 
504

Accretion
64

 
1,976

 
1,473

 
3,513

Changes in estimates recorded to statement of operations
(34
)
 
(277
)
 
256

 
(55
)
Expenditures
(30
)
 
(3,099
)
 
(4,328
)
 
(7,457
)
Currency translation and other
(1
)
 
2,742

 
(1,740
)
 
1,001

Balance at September 30, 2017
$
1,776

 
$
65,493

 
$
58,244

 
$
125,513