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CLOSURE AND POST-CLOSURE LIABILITIES
 6 Months Ended
Jun. 30, 2016
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”) from January 1, 2016 through June 30, 2016 were as follows (in thousands):
 
Landfill
Retirement
Liability
 
Non-Landfill
Retirement
Liability
 
Total
Balance at January 1, 2016
$
32,023

 
$
24,226

 
$
56,249

Adjustments during the measurement period related to acquisitions
—

 
657

 
657

New asset retirement obligations
1,263

 
—

 
1,263

Accretion
1,384

 
1,150

 
2,534

Changes in estimates recorded to statement of operations
(597
)
 
(91
)
 
(688
)
Expenditures
(475
)
 
(570
)
 
(1,045
)
Currency translation and other
152

 
64

 
216

Balance at June 30, 2016
$
33,750

 
$
25,436

 
$
59,186


All of the landfill facilities included in the above were active as of June 30, 2016. There were no significant charges (benefits) in 2016 resulting from changes in estimates for closure and post-closure liabilities.
New asset retirement obligations incurred during the first six months of 2016 were discounted at the credit-adjusted risk-free rate of 6.23%.