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CUSTOMER FUNDS - Assets Underlying Customer Funds (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Customer funds $ 4,046,346 $ 3,170,430
Cash    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 3,109,317 2,137,634
Cash Equivalents | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 4,645 4,042
Cash Equivalents | Reverse repurchase agreement    
Debt Securities, Available-for-sale [Line Items]    
Customer funds $ 932,384 $ 1,028,754