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GOODWILL AND INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill Activity A summary of the activity and balances related to goodwill by operating segment is as follows:
December 31,
2021		AcquisitionsAdjustments to AcquisitionsJune 30,
2022
Eastern$52,072 $93 $237 $52,402 
Western163,728 7,350 650 171,728 
Resource Solutions 17,060 21,318 — 38,378 
Total$232,860 $28,761 $887 $262,508 
Summary of Intangible Assets by Type
Summaries of intangible assets by type follows:
Covenants
Not-to-Compete		Customer RelationshipsTrade NamesTotal
Balance, June 30, 2022
Intangible assets$30,193 $124,680 $8,350 $163,223 
Less accumulated amortization(23,094)(40,296)(3,071)(66,461)
$7,099 $84,384 $5,279 $96,762 

 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 
Summary of Intangible Amortization Expense Estimated A summary of intangible amortization expense estimated for the five fiscal years following fiscal year 2021 and thereafter follows:
Estimated Future Amortization Expense as of June 30, 2022 
Fiscal year ending December 31, 2022$8,158 
Fiscal year ending December 31, 2023$15,600 
Fiscal year ending December 31, 2024$14,879 
Fiscal year ending December 31, 2025$13,758 
Fiscal year ending December 31, 2026$12,123 
Thereafter$32,244