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GOODWILL AND INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2024
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,
2023		AcquisitionsMeasurement Period AdjustmentsJune 30,
2024
Eastern$73,893 $355 $— $74,248 
Western285,056 — 668 285,724 
Mid-Atlantic332,247 — 372 332,619 
Resource Solutions 44,474 — 188 44,662 
$735,670 $355 $1,228 $737,253 
Summaries of intangible assets by type follow:
Covenants
Not-to-Compete		Customer RelationshipsTrade NamesTotal
Balance, June 30, 2024
Intangible assets
$60,645 $272,807 $13,325 $346,777 
Less accumulated amortization(30,294)(90,284)(9,238)(129,816)
$30,351 $182,523 $4,087 $216,961 

 Covenants
Not-to-Compete		Customer RelationshipsTrade NamesTotal
Balance, December 31, 2023
Intangible assets
$61,573 $272,571 $13,325 $347,469 
Less accumulated amortization(26,645)(72,227)(7,168)(106,040)
$34,928 $200,344 $6,157 $241,429 
Intangible amortization expense was $12,238 and $24,803 during the three and six months ended June 30, 2024, respectively, and $4,226 and $8,296 during the three and six months ended June 30, 2023, respectively.
A summary of intangible amortization expense estimated for each of the next five fiscal years following fiscal year 2023 and thereafter is estimated as follows:
Estimated Future Amortization Expense as of June 30, 2024 
For the remainder of the fiscal year ending December 31, 2024
$23,219 
Fiscal year ending December 31, 2025$43,653 
Fiscal year ending December 31, 2026$38,775 
Fiscal year ending December 31, 2027$34,179 
Fiscal year ending December 31, 2028$29,123 
Thereafter$48,012