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GOODWILL AND INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2021
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 reportable operating segment is as follows:
 December 31, 2020AcquisitionsDecember 31, 2021
Eastern$30,873 $21,199 $52,072 
Western149,984 13,744 163,728 
Resource Solutions14,044 3,016 17,060 
Total$194,901 $37,959 $232,860 
 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 
A summary of intangible assets is as follows:
 Covenants
Not-to-Compete		Customer RelationshipsTrade NamesTotal
Balance, December 31, 2021
Intangible assets$28,777 $115,005 $8,350 $152,132 
Less accumulated amortization(22,148)(34,809)(1,452)(58,409)
$6,629 $80,196 $6,898 $93,723 
 Covenants
Not-to-Compete		Customer RelationshipsTotal
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 
Intangible amortization expense for fiscal years 2021, 2020 and 2019 was $10,953, $8,893 and $7,218, respectively.
The intangible amortization expense estimated for the five fiscal years following fiscal year 2021 and thereafter is as follows:
Estimated Future Amortization Expense as of December 31, 2021
Fiscal year ending December 31, 2022$14,605 
Fiscal year ending December 31, 2023$13,662 
Fiscal year ending December 31, 2024$13,267 
Fiscal year ending December 31, 2025$12,469 
Fiscal year ending December 31, 2026$11,022 
Thereafter$28,698