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CUSTOMER FUNDS - Assets Underlying Customer Funds (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Customer funds $ 2,649,114 $ 2,037,832
Customer Funds In Transit    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 0 262,562
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 53,563 113,178
U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 412,261 333,346
Cash    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 162,247 145,577
Cash Equivalents | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 1,485,002 777,193
Cash Equivalents | Reverse repurchase agreement    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 402,097 246,880
Cash Equivalents | U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Customer funds 0 47,300
Cash Equivalents | U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Customer funds $ 133,944 $ 111,796