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CLOSURE AND POST-CLOSURE LIABILITIES
 6 Months Ended
Jun. 30, 2018
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, 2018 through June 30, 2018 were as follows (in thousands):
 
Landfill
Retirement
Liability
 
Non-Landfill
Retirement
Liability
 
Total
Balance at January 1, 2018
$
32,382

 
$
28,655

 
$
61,037

Liabilities assumed in acquisition
—

 
604

 
604

New asset retirement obligations
1,478

 
—

 
1,478

Accretion
1,284

 
1,245

 
2,529

Changes in estimates recorded to statement of operations
—

 
85

 
85

Changes in estimates recorded to balance sheet
430

 
—

 
430

Expenditures
(359
)
 
(88
)
 
(447
)
Currency translation and other
(127
)
 
(85
)
 
(212
)
Balance at June 30, 2018
$
35,088

 
$
30,416

 
$
65,504


All of the landfill facilities included in the above were active as of June 30, 2018. There were no significant charges (benefits) in 2018 resulting from changes in estimates for closure and post-closure liabilities.
New asset retirement obligations incurred during the first six months of 2018 were discounted at the credit-adjusted risk-free rate of 5.66%.