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CLOSURE AND POST-CLOSURE LIABILITIES
 9 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
CLOSURE AND POST-CLOSURE LIABILITIES
CLOSURE AND POST-CLOSURE LIABILITIES
The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2015 were as follows (in thousands):
 
Landfill
Retirement
Liability
 
Non-Landfill
Retirement
Liability
 
Total
Balance at January 1, 2015
$
29,932

 
$
20,769

 
$
50,701

Liabilities assumed in acquisitions
—

 
1,676

 
1,676

New asset retirement obligations
2,325

 
—

 
2,325

Accretion
1,887

 
1,567

 
3,454

Changes in estimates recorded to statement of income
13

 
—

 
13

Changes in estimates recorded to balance sheet
1,370

 
—

 
1,370

Expenditures
(5,490
)
 
(259
)
 
(5,749
)
Currency translation and other
(323
)
 
(203
)
 
(526
)
Balance at September 30, 2015
$
29,714

 
$
23,550

 
$
53,264


All of the landfill facilities included in the above were active as of September 30, 2015. New asset retirement obligations incurred during the first nine months of 2015 were discounted at the credit-adjusted risk-free rate of 5.99%. There were no significant charges (benefits) in 2015 resulting from changes in estimates for closure and post-closure liabilities.