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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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 |
| December 31, 2015 |  | Acquisitions |  | December 31, 2016
Eastern | $ | 17,429 |  |  | $ | — |  |  | $ | 17,429 |
Western | 87,503 |  |  | 923 |  |  | 88,426 |
Recycling | 12,315 |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | 1,729 |
Total | $ | 118,976 |  |  | $ | 923 |  |  | $ | 119,899 |
Components of Intangible Assets | A summary of intangible assets is as follows:
| 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 |
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2016 |  |  |  |  |
Intangible assets | $ | 17,594 |  |  | $ | 16,071 |  |  | $ | 33,665 |
Less accumulated amortization | (16,402 | ) |  | (9,567 | ) |  | (25,969 | )
| $ | 1,192 |  |  | $ | 6,504 |  |  | $ | 7,696 |
Estimated Future Amortization Expense | The intangible amortization expense estimated for the five fiscal years following fiscal year 2017 and thereafter is as follows:
Estimated Future Amortization Expense as of December 31, 2017 |
For the fiscal year ending December 31, 2018 | $ | 2,021 |
For the fiscal year ending December 31, 2019 | $ | 1,637 |
For the fiscal year ending December 31, 2020 | $ | 1,432 |
For the fiscal year ending December 31, 2021 | $ | 1,128 |
For the fiscal year ending December 31, 2022 | $ | 821 |
Thereafter | $ | 1,110 |

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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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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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 + Details
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