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CUSTOMER FUNDS - Investments within Customer Funds (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 2,320,232  
Fair Value 2,319,916  
Customer funds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 465,836 $ 446,479
Gross Unrealized Gains 18 50
Gross Unrealized Losses (30) (5)
Fair Value 465,824 446,524
Customer funds | U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 53,568 113,156
Gross Unrealized Gains 0 22
Gross Unrealized Losses (5) 0
Fair Value 53,563 113,178
Customer funds | U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 412,268 333,323
Gross Unrealized Gains 18 28
Gross Unrealized Losses (25) (5)
Fair Value $ 412,261 $ 333,346