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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