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GOODWILL AND INTANGIBLE ASSETS (Tables)
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill Activity A summary of the activity and balances related to goodwill by reporting segment is as follows:
December 31,
2020
AcquisitionsJune 30,
2021
Eastern region $30,873 $46 $30,919 
Western region149,984 1,739 151,723 
Resource solutions 14,044 — 14,044 
Total$194,901 $1,785 $196,686 
Summary of Intangible Assets by Type
Summaries of intangible assets by type follows:
Covenants
Not-to-Compete
Client ListsTotal
Balance, June 30, 2021
Intangible assets$27,390 $80,036 $107,426 
Less accumulated amortization(21,323)(30,176)(51,499)
$6,067 $49,860 $55,927 

 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 
Summary of Intangible Amortization Expense Estimated A summary of intangible amortization expense estimated for the five fiscal years following fiscal year 2020 and thereafter follows:
Estimated Future Amortization Expense as of June 30, 2021 
Fiscal year ending December 31, 2021$4,038 
Fiscal year ending December 31, 2022$7,440 
Fiscal year ending December 31, 2023$7,183 
Fiscal year ending December 31, 2024$8,098 
Fiscal year ending December 31, 2025$8,301 
Thereafter$20,867