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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Fair Value Disclosures [Abstract]      
Cash and cash equivalents held to satisfy client funds obligations $ 119,873 $ 147,305 $ 115,657
Short-term marketable securities held to satisfy client funds obligations 11,420 10,042  
Long-term marketable securities held to satisfy client funds obligations 59,145 61,728  
Total funds held for clients $ 190,438 $ 219,075