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GOODWILL AND INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2020
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, 2019 |  | Acquisitions |  |  |  | December 31, 2020
Eastern | $ | 30,720 |  |  | $ | 153 |  |  |  |  | $ | 30,873 |
Western | 141,055 |  |  | 8,929 |  |  |  |  | 149,984 |
Resource Solutions | 14,044 |  |  | — |  |  |  |  | 14,044 |
Total | $ | 185,819 |  |  | $ | 9,082 |  |  |  |  | $ | 194,901 |
| December 31, 2018 |  | Acquisitions |  | Other (1) |  | December 31, 2019
Eastern | $ | 28,154 |  |  | $ | 2,566 |  |  | $ | — |  |  | $ | 30,720 |
Western | 120,536 |  |  | 23,138 |  |  | (2,619) |  |  | 141,055 |
Resource Solutions | 14,044 |  |  | — |  |  | — |  |  | 14,044 |
Total | $ | 162,734 |  |  | $ | 25,704 |  |  | $ | (2,619) |  |  | $ | 185,819 |
(1)Relates to unregistered sale of Class A common stock that was previously held in escrow and released to us for liquidation. See Note 14, Stockholders' Equity for additional disclosure. A summary of intangible assets is as follows:
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2020 |  |  |  |  |
Intangible assets | $ | 26,971 |  |  | $ | 78,809 |  |  | $ | 105,780 |
Less accumulated amortization | (20,547) |  |  | (26,909) |  |  | (47,456) |
| $ | 6,424 |  |  | $ | 51,900 |  |  | $ | 58,324 |
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2019 |  |  |  |  |
Intangible assets | $ | 26,162 |  |  | $ | 71,122 |  |  | $ | 97,284 |
Less accumulated amortization | (18,968) |  |  | (19,595) |  |  | (38,563) |
| $ | 7,194 |  |  | $ | 51,527 |  |  | $ | 58,721 |
Intangible amortization expense for fiscal years 2020, 2019 and 2018 was $8,893, $7,218 and $3,316, respectively. The intangible amortization expense estimated for the five fiscal years following fiscal year 2020 and thereafter is as follows:
Estimated Future Amortization Expense as of December 31, 2020 |
Fiscal year ending December 31, 2021 | $ | 7,869 |
Fiscal year ending December 31, 2022 | $ | 7,208 |
Fiscal year ending December 31, 2023 | $ | 6,969 |
Fiscal year ending December 31, 2024 | $ | 7,898 |
Fiscal year ending December 31, 2025 | $ | 8,116 |
Thereafter | $ | 20,264 |

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- Definition The entire disclosure for goodwill and 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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