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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
3 Months Ended
Mar. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities
A summary of the changes to accrued final capping, closure and post-closure liabilities follows:
 
Three Months Ended
March 31,
 
2017
 
2016
Beginning balance
$
44,207

 
$
41,041

Obligations incurred
556

 
526

Accretion expense
965

 
886

Obligations settled (1)
(126
)
 
(198
)
Ending balance
$
45,602

 
$
42,255

 
(1)
Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.