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CLOSURE AND POST-CLOSURE LIABILITIES
6 Months Ended
Jun. 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 six months ended June 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
1,327

 

 
1,327

Accretion
1,305

 
1,021

 
2,326

Changes in estimates recorded to statement of income
60

 
25

 
85

Changes in estimates recorded to balance sheet
(932
)
 

 
(932
)
Expenditures
(2,980
)
 
(86
)
 
(3,066
)
Currency translation and other
(166
)
 
(105
)
 
(271
)
Balance at June 30, 2015
$
28,546

 
$
23,300

 
$
51,846


All of the landfill facilities included in the above were active as of June 30, 2015. New asset retirement obligations incurred during the first six 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.