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CLOSURE AND POST-CLOSURE LIABILITIES
 6 Months Ended
Jun. 30, 2017
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, 2017 through June 30, 2017 were as follows (in thousands):
 
Landfill
Retirement
Liability
 
Non-Landfill
Retirement
Liability
 
Total
Balance at January 1, 2017
$
30,630

 
$
27,701

 
$
58,331

Measurement period adjustments from prior period acquisitions
—

 
596

 
596

New asset retirement obligations
894

 
—

 
894

Adjustment related to disposition of business
—

 
(1,170
)
 
(1,170
)
Accretion
1,094

 
1,270

 
2,364

Changes in estimates recorded to statement of operations
—

 
(262
)
 
(262
)
Changes in estimates recorded to balance sheet
—

 
(287
)
 
(287
)
Expenditures
(556
)
 
(254
)
 
(810
)
Currency translation and other
82

 
55

 
137

Balance at June 30, 2017
$
32,144

 
$
27,649

 
$
59,793


All of the landfill facilities included in the above were active as of June 30, 2017. There were no significant charges (benefits) in 2017 resulting from changes in estimates for closure and post-closure liabilities.
New asset retirement obligations incurred during the first six months of 2017 were discounted at the credit-adjusted risk-free rate of 6.32%.