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GOODWILL AND INTANGIBLE ASSETS
3 Months Ended
Mar. 31, 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
Measurement Period AdjustmentsMarch 31,
2024
Eastern$73,893 $— $73,893 
Western285,056 762 285,818 
Mid-Atlantic332,247 (107)332,140 
Resource Solutions 44,474 188 44,662 
$735,670 $843 $736,513 
Summaries of intangible assets by type follows:
Covenants
Not-to-Compete
Customer RelationshipsTrade NamesTotal
Balance, March 31, 2024
Intangible assets$61,573 $272,571 $13,325 $347,469 
Less accumulated amortization(29,569)(80,514)(8,521)(118,604)
$32,004 $192,057 $4,804 $228,865 

 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 $12,564 during the three months ended March 31, 2024, and $4,071 during the three months ended March 31, 2023.
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 March 31, 2024 
Fiscal year ending December 31, 2024$35,421 
Fiscal year ending December 31, 2025$43,593 
Fiscal year ending December 31, 2026$38,720 
Fiscal year ending December 31, 2027$34,129 
Fiscal year ending December 31, 2028$29,077 
Thereafter$47,925