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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
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Fair Value Disclosures [Abstract] |  |  |
Restricted cash and cash equivalents held to satisfy client funds obligations | $ 131,284 | $ 139,459 | $ 184,927
Restricted short-term marketable securities held to satisfy client funds obligations | 20,385 | 12,781 |
Restricted long-term marketable securities held to satisfy client funds obligations | 64,845 | 75,871 |
Total funds held for clients | $ 216,514 | $ 228,111 |

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