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REMEDIAL LIABILITIES (Tables)
 3 Months Ended
Mar. 31, 2013
Environmental Remediation Obligations [Abstract]  
Changes to remedial liabilities
The changes to remedial liabilities for the three months ended March 31, 2013 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, 2013
 
$
5,829

 
$
71,079

 
$
90,312

 
$
167,220

Adjustments during the measurement period related to acquisitions
 
—

 
8,578

 
2,072

 
10,650

Accretion
 
70

 
826

 
783

 
1,679

Changes in estimates recorded to statement of income
 
(21
)
 
(165
)
 
86

 
(100
)
Expenditures
 
(14
)
 
(1,843
)
 
(2,430
)
 
(4,287
)
Currency translation and other
 
(67
)
 
(33
)
 
(494
)
 
(594
)
Balance at March 31, 2013
 
$
5,797

 
$
78,442

 
$
90,329

 
$
174,568