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GOODWILL AND INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2022
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 operating segment is as follows:
December 31,
2021		AcquisitionsAdjustments to AcquisitionsSeptember 30,
2022
Eastern$52,072 $93 $241 $52,406 
Western163,728 16,892 650 181,270 
Resource Solutions 17,060 21,706 — 38,766 
$232,860 $38,691 $891 $272,442 
Summaries of intangible assets by type follows:
Covenants
Not-to-Compete		Customer RelationshipsTrade NamesTotal
Balance, September 30, 2022
Intangible assets$30,812 $126,372 $8,350 $165,534 
Less accumulated amortization(23,609)(43,254)(3,879)(70,742)
$7,203 $83,118 $4,471 $94,792 

 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 

Intangible amortization expense was $4,281 and $12,333 during the three and nine months ended September 30, 2022, respectively, and $3,133 and $7,175 during the three and nine months ended September 30, 2021, respectively.
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 September 30, 2022 
Fiscal year ending December 31, 2022$4,194 
Fiscal year ending December 31, 2023$15,918 
Fiscal year ending December 31, 2024$15,278 
Fiscal year ending December 31, 2025$14,244 
Fiscal year ending December 31, 2026$12,579 
Thereafter$32,579