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GOODWILL AND INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
The following table summarizes changes in goodwill during the nine months ended September 30, 2025:
(in thousands)
Balance at December 31, 2024$1,161,085 
Additions193,291 
Measurement period adjustments(5,021)
Adjustments due to currency translation and other8,887 
Balance at September 30, 2025$1,358,242 
The following table sets forth the components of indefinite-lived and amortizable intangible assets as of September 30, 2025 and December 31, 2024.
September 30, 2025December 31, 2024
(in thousands)
GrossAccumulated
Amortization		Carrying
Value		GrossAccumulated
Amortization		Carrying
Value		Useful Life
in Years
Amortizable intangible assets:
Customer contracts$736,075 $(314,325)$421,750 $671,242 $(288,150)$383,092 
3-20
Trademarks and tradenames25,963 (15,379)10,584 24,559 (12,480)12,079 
7-20
Other intangible assets28,357 (19,529)8,828 26,507 (17,905)8,602 
3-20
Total amortizable intangible assets$790,395 $(349,233)$441,162 $722,308 $(318,535)$403,773 
Indefinite-lived intangible assets157,029 137,816 
Total intangible assets, excluding goodwill$598,191 $541,589 
Amortization expense related to intangible assets was $23.7 million and $19.2 million for the three months ended September 30, 2025 and 2024, respectively. Amortization expense related to intangible assets was $67.4 million and $57.2 million for the nine months ended September 30, 2025 and 2024, respectively. Amortizable intangible assets are amortized on a straight-line basis over their economic useful lives.
Estimated amortization expense for the existing carrying amount of amortizable intangible assets for each of the five succeeding fiscal years as of September 30, 2025 are as follows:
(in thousands)
2025 (excluding the nine months ended September 30, 2025)$22,955 
202691,265 
202787,149 
202875,990 
202962,041