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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 157,303 | $ 296,408 | $ 173,599
Debt Securities, Available-for-sale, Current | 3,297 | 4,249 |
Debt Securities, Available-for-sale, Noncurrent | 14,154 | 20,412 |
Total funds held for clients | $ 174,754 | $ 321,069 |

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