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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Other intangible assets |  |
Gross | $ 1,720,299 | $ 1,687,390
Accumulated Amortization | (834,013) | (732,115)
Net | 886,286 | 955,275
Client relationships |  |
Other intangible assets |  |
Gross | 1,515,254 | 1,491,926
Accumulated Amortization | (679,587) | (591,417)
Net | 835,667 | 900,509
Technology |  |
Other intangible assets |  |
Gross | 139,124 | 129,626
Accumulated Amortization | (107,488) | (101,655)
Net | 31,636 | 27,971
Backlog |  |
Other intangible assets |  |
Gross | 15,272 | 15,236
Accumulated Amortization | (14,041) | (12,512)
Net | 1,231 | 2,724
Trademarks and trade names |  |
Other intangible assets |  |
Gross | 12,655 | 12,617
Accumulated Amortization | (5,183) | (4,410)
Net | 7,472 | 8,207
Other |  |
Other intangible assets |  |
Gross | 37,994 | 37,985
Accumulated Amortization | (27,714) | (22,121)
Net | $ 10,280 | $ 15,864

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