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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
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Fair Value Disclosures [Abstract] |  |  |
Cash and cash equivalents held to satisfy client funds obligations | $ 121,480 | $ 147,305 | $ 103,514
Short-term marketable securities held to satisfy client funds obligations | 10,654 | 10,042 |
Long-term marketable securities held to satisfy client funds obligations | 61,455 | 61,728 |
Total funds held for clients | $ 193,589 | $ 219,075 |

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