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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Activity and Balances Related to Goodwill by Operating Segment | A summary of the activity and balances related to goodwill by operating segment follows:
| December 31, 2017 |  | Acquisitions |  | September 30, 2018
Eastern region (1) | $ | 19,192 |  |  | $ | 5,601 |  |  | $ | 24,793 |
Western region | 89,369 |  |  | 22,823 |  |  | 112,192 |
Recycling | 12,315 |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | 1,729 |
Total | $ | 122,605 |  |  | $ | 28,424 |  |  | $ | 151,029 |
(1) | The acquisitions amount includes a $1,230 goodwill adjustment for the tax treatment associated with the Complete acquisition. See Note 13, Income Taxes for additional disclosure.
Summary of Intangible Assets by Intangible Asset Type | A summary of intangible assets by intangible asset type follows:
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, September 30, 2018 |  |  |  |  |
Intangible assets | $ | 19,192 |  |  | $ | 37,287 |  |  | $ | 56,479 |
Less accumulated amortization | (17,371 | ) |  | (12,507 | ) |  | (29,878 | )
| $ | 1,821 |  |  | $ | 24,780 |  |  | $ | 26,601 |
| 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 |
Summary of Intangible Amortization Expense Estimated | A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2017 and thereafter follows:
Estimated Future Amortization Expense as of September 30, 2018 |
Fiscal year ending December 31, 2018 | $ | 1,280 |
Fiscal year ending December 31, 2019 | $ | 4,492 |
Fiscal year ending December 31, 2020 | $ | 3,849 |
Fiscal year ending December 31, 2021 | $ | 2,875 |
Fiscal year ending December 31, 2022 | $ | 2,366 |
Thereafter | $ | 11,739 |

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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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