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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Funds Held For Clients (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]      
Restricted Cash and Cash Equivalents $ 137,536 $ 185,316 $ 190,318
Debt Securities, Available-for-sale, Current 7,161 5,559  
Debt Securities, Available-for-sale, Noncurrent 39,964 26,501  
Total funds held for clients $ 184,661 $ 217,376