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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
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