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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
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Fair Value Disclosures [Abstract] |  |  |
Restricted cash and cash equivalents held to satisfy client funds obligations | $ 115,657 | $ 147,032 | $ 137,536
Restricted short-term marketable securities held to satisfy client funds obligations | 9,762 | 9,174 |
Restricted long-term marketable securities held to satisfy client funds obligations | 61,098 | 47,382 |
Total funds held for clients | $ 186,517 | $ 203,588 |

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