| GOODWILL AND INTANGIBLE ASSETS |
GOODWILL AND INTANGIBLE ASSETS A summary of the activity and balances related to goodwill by reportable operating segment is as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Acquisitions | | Business Combination Adjustments | | | | | | | | June 30, 2026 | | Eastern | $ | 110,533 | | | $ | 166,778 | | | $ | — | | | | | | | | | $ | 277,311 | | | Western | 371,035 | | | 1,447 | | | 573 | | | | | | | | | 373,055 | | | Mid-Atlantic | 584,136 | | | 74,062 | | | — | | | | | | | | | 658,198 | | | Resource Solutions | 54,352 | | | 9,857 | | | — | | | | | | | | | 64,209 | | | | | | | | | | | | | | | | | $ | 1,120,056 | | | $ | 252,144 | | | $ | 573 | | | | | | | | | $ | 1,372,773 | |
Summaries of intangible assets, net by type follow: | | | | | | | | | | | | | | | | | | | | | | | | | Covenants Not-to-Compete | | Customer Relationships | | Trade Names | | Total | | Balance, June 30, 2026 | | | | | | | | Intangible assets | $ | 88,574 | | | $ | 504,386 | | | $ | 27,005 | | | $ | 619,965 | | | Less accumulated amortization | (47,797) | | | (210,039) | | | (20,540) | | | (278,376) | | | $ | 40,777 | | | $ | 294,347 | | | $ | 6,465 | | | $ | 341,589 | |
| | | | | | | | | | | | | | | | | | | | | | | | | Covenants Not-to-Compete | | Customer Relationships | | Trade Names | | Total | | Balance, December 31, 2025 | | | | | | | | Intangible assets | $ | 74,892 | | | $ | 427,625 | | | $ | 26,309 | | | $ | 528,826 | | | Less accumulated amortization | (43,041) | | | (176,824) | | | (18,106) | | | (237,971) | | | $ | 31,851 | | | $ | 250,801 | | | $ | 8,203 | | | $ | 290,855 | |
Intangible amortization expense was $22,030 and $40,406 during the three and six months ended June 30, 2026, respectively, and $19,117 and $38,583 during the three and six months ended June 30, 2025, respectively. Based on the amortizable intangible assets recorded in the consolidated balance sheets at June 30, 2026, intangible amortization expense for each of the next five fiscal years and thereafter is estimated as follows: | | | | | | | | | Estimated Future Intangible Amortization Expense as of June 30, 2026 |
| | For the remainder of the fiscal year ending December 31, 2026 | $ | 41,808 | | | Fiscal year ending December 31, 2027 | $ | 76,226 | | | Fiscal year ending December 31, 2028 | $ | 65,502 | | | Fiscal year ending December 31, 2029 | $ | 52,246 | | | Fiscal year ending December 31, 2030 | $ | 39,220 | | | Thereafter | $ | 66,587 | | | |
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