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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

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