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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS - Schedule of Acquired Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Goodwill [Line Items] |  |
Gross Carrying Amount | $ 847,509 | $ 916,186
Accumulated Amortization | (524,991) | (534,822)
Net Carrying Amount | 322,518 | 381,364
Staffing databases |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 52,336 | 52,336
Accumulated Amortization | (41,662) | (39,879)
Net Carrying Amount | 10,674 | 12,457
Customer relationships |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 467,321 | 532,048
Accumulated Amortization | (220,855) | (247,550)
Net Carrying Amount | 246,466 | 284,498
Tradenames and trademarks |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 282,168 | 284,488
Accumulated Amortization | (219,632) | (204,159)
Net Carrying Amount | 62,536 | 80,329
Non-compete agreements |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 9,399 | 9,399
Accumulated Amortization | (8,240) | (7,783)
Net Carrying Amount | 1,159 | 1,616
Acquired technology |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 36,285 | 37,915
Accumulated Amortization | (34,602) | (35,451)
Net Carrying Amount | $ 1,683 | $ 2,464

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