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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

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