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GOODWILL AND INTANGIBLE ASSETS | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLE ASSETS | GOODWILL AND INTANGIBLE ASSETS A summary of the activity and balances related to goodwill by reporting segment is as follows:
| December 31, 2018 |  | Acquisitions |  | June 30, 2019
Eastern region | $ | 28,154 |  |  | $ | 2,566 |  |  | $ | 30,720 |
Western region | 120,536 |  |  | 4,566 |  |  | 125,102 |
Recycling | 12,315 |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | 1,729 |
Total | $ | 162,734 |  |  | $ | 7,132 |  |  | $ | 169,866 |
A summary of intangible assets by intangible asset type follows:
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, June 30, 2019 |  |  |  |  |
Intangible assets | $ | 25,669 |  |  | $ | 52,063 |  |  | $ | 77,732 |
Less accumulated amortization | (18,195 | ) |  | (16,190 | ) |  | (34,385 | )
| $ | 7,474 |  |  | $ | 35,873 |  |  | $ | 43,347 |
| 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 |
Intangible amortization expense was $1,639 and $3,039 during the three and six months ended June 30, 2019, respectively, as compared to $567 and $1,134 during the three and six months ended June 30, 2018, respectively. A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2018 and thereafter follows:
Estimated Future Amortization Expense as of June 30, 2019 |
Fiscal year ending December 31, 2019 | $ | 3,443 |
Fiscal year ending December 31, 2020 | $ | 6,340 |
Fiscal year ending December 31, 2021 | $ | 5,417 |
Fiscal year ending December 31, 2022 | $ | 4,853 |
Fiscal year ending December 31, 2023 | $ | 4,565 |
Thereafter | $ | 18,729 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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