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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 203,796 | $ 185,316 | $ 231,564
Debt Securities, Available-for-sale, Current | 7,227 | 5,559 |
Debt Securities, Available-for-sale, Noncurrent | 27,656 | 26,501 |
Total funds held for clients | $ 238,679 | $ 217,376 |

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