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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Activity and Balances Related to Goodwill by Reporting Segment | A summary of the activity and balances related to goodwill by reporting segment is as follows:
| December 31, 2017 |  | Acquisitions |  | December 31, 2018
Eastern | $ | 19,192 |  |  | $ | 8,962 |  |  | $ | 28,154 |
Western | 89,369 |  |  | 31,167 |  |  | 120,536 |
Recycling | 12,315 |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | 1,729 |
Total | $ | 122,605 |  |  | $ | 40,129 |  |  | $ | 162,734 |
| December 31, 2016 |  | Acquisitions |  | December 31, 2017
Eastern | $ | 17,429 |  |  | $ | 1,763 |  |  | $ | 19,192 |
Western | 88,426 |  |  | 943 |  |  | 89,369 |
Recycling | 12,315 |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | 1,729 |
Total | $ | 119,899 |  |  | $ | 2,706 |  |  | $ | 122,605 |
Components of Intangible Assets | A summary of intangible assets is as follows:
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2018 |  |  |  |  |
Intangible assets | $ | 21,750 |  |  | $ | 44,363 |  |  | $ | 66,113 |
Less accumulated amortization | (17,584 | ) |  | (13,762 | ) |  | (31,346 | )
| $ | 4,166 |  |  | $ | 30,601 |  |  | $ | 34,767 |
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2017 |  |  |  |  |
Intangible assets | $ | 18,092 |  |  | $ | 18,087 |  |  | $ | 36,179 |
Less accumulated amortization | (16,851 | ) |  | (11,179 | ) |  | (28,030 | )
| $ | 1,241 |  |  | $ | 6,908 |  |  | $ | 8,149 |
Estimated Future Amortization Expense | The intangible amortization expense estimated for the five fiscal years following fiscal year 2018 and thereafter is as follows:
Estimated Future Amortization Expense as of December 31, 2018 |
For the fiscal year ending December 31, 2019 | $ | 5,601 |
For the fiscal year ending December 31, 2020 | $ | 4,997 |
For the fiscal year ending December 31, 2021 | $ | 4,094 |
For the fiscal year ending December 31, 2022 | $ | 3,534 |
For the fiscal year ending December 31, 2023 | $ | 3,231 |
Thereafter | $ | 13,310 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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