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CUSTOMER FUNDS - Contractual Maturities of Short-Term and Long-Term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized Cost    
Due in one year or less $ 868,162  
Due in one to five years 1,452,070  
Amortized Cost 2,320,232  
Fair Value    
Due in one year or less 868,809  
Due in one to five years 1,451,107  
Fair Value 2,319,916  
Customer funds    
Amortized Cost    
Due in one year or less 465,836  
Due in one to five years 0  
Amortized Cost 465,836 $ 446,479
Fair Value    
Due in one year or less 465,824  
Due in one to five years 0  
Fair Value $ 465,824 $ 446,524