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GOODWILL AND INTANGIBLE ASSETS
 12 Months Ended
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, 2019AcquisitionsDecember 31, 2020
Eastern$30,720 $153 $30,873 
Western141,055 8,929 149,984 
Resource Solutions14,044 — 14,044 
Total$185,819 $9,082 $194,901 
 December 31, 2018AcquisitionsOther (1)December 31, 2019
Eastern$28,154 $2,566 $— $30,720 
Western120,536 23,138 (2,619)141,055 
Resource Solutions14,044 — — 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 ListsTotal
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 ListsTotal
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