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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 |
2019 | $ | 15,572 |
2020 | 12,678 |
2021 | 10,117 |
2022 | 7,953 |
2023 | 6,250 |
Thereafter | 65,145 |
Total minimum lease payments | $ | 117,715 |
Schedule of Environmental Remedial Liability | The changes to the environmental remediation liability associated with the Southbridge Landfill are as follows:
| Fiscal Year Ended December 31,
| 2018 |  | 2017
Beginning balance | $ | 5,936 |  |  | $ | — |
Accretion expense | 152 |  |  | 82 |
Obligations incurred | — |  |  | 6,379 |
Obligations settled (1) | (915 | ) |  | (525 | )
Ending balance | $ | 5,173 |  |  | $ | 5,936 |
(1) | Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.
A summary of the changes to the environmental remediation liability associated with the Potsdam environmental remediation liability follows:
| Fiscal Year Ended December 31,
| 2018 |  | 2017
Beginning balance | $ | 5,758 |  |  | $ | 5,866 |
Payments | (171 | ) |  | (108 | )
Obligations incurred | 27 |  |  | — |
Ending balance | $ | 5,614 |  |  | $ | 5,758 |
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, 2018
2019 | $ | 3,974 |
2020 | 1,289 |
2021 | 398 |
2022 | 372 |
2023 | 383 |
Thereafter | 5,250 |
Total | $ | 11,666 |
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 | $ | 11,666 |
Less discount, net | (879 | )
Liability balance - December 31, 2018 | $ | 10,787 |

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13283-110859 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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