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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
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Fair Value Disclosures [Abstract] |  |  |
Restricted cash and cash equivalents held to satisfy client funds obligations | $ 63,947 | $ 124,287 | $ 121,480
Restricted short-term marketable securities held to satisfy client funds obligations | 11,376 | 5,273 |
Restricted long-term marketable securities held to satisfy client funds obligations | 73,015 | 63,055 |
Total funds held for clients | $ 148,338 | $ 192,615 |

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