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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments under Non-Cancellable Operating Leases
Future minimum rental payments under non-cancellable operating leases, which include landfill operating leases, are as follows:
Estimated Future Minimum Lease Payments as of December 31, 2017
 
2018
$
18,465

2019
14,365

2020
10,511

2021
7,905

2022
5,705

Thereafter
33,760

Total minimum lease payments
$
90,711
Schedule of Environmental Liability Associated with Potsdam
A summary of the changes to the environmental remediation liability associated with the Potsdam environmental remediation liability follows:
 
Fiscal Year Ended
December 31,
 
2017
 
2016
Beginning balance
$
5,866

 
$
5,221

Payments
(108
)
 
(255
)
Obligations incurred
—

 
900

Ending balance
$
5,758

 
$
5,866

The changes to the environmental remediation liability associated with the Southbridge Landfill are as follows:
 
 
 
 
 
Fiscal Year Ended
December 31,
 
2017
 
2016
Beginning balance
$
—

 
$
—

Accretion expense
82

 
—

Obligations incurred
6,379

 
—

Obligations settled (1)
(525
)
 
—

Ending balance
$
5,936

 
$
—

(1)
Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.
Schedule of Total Expected Environmental Remediation Payments for Succeeding Year
The total expected environmental remediation payments, in today’s dollars, for each of the five succeeding fiscal years and the aggregate amount thereafter are as follows:
Estimated Future Environmental Remediation Payments as of December 31, 2017
2018
$
865

2019
4,339

2020
755

2021
403

2022
385

Thereafter
6,621

Total
$
13,368
Reconciliation of Expected Aggregate Non-inflated, Undiscounted Environmental Remediation Liability to Amount Recognized in Statement of Financial Position
A reconciliation of the expected aggregate non-inflated, undiscounted environmental remediation liability to the amount recognized in the statement of financial position is as follows:
 
 
Undiscounted liability
$
13,368

Less discount, net
(1,674
)
Liability balance - December 31, 2017
$
11,694