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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

X

- Definition

Carrying amount as of the balance sheet date of amounts received from and refundable to customers unless used by them to obtain goods and services from the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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+ References

No definition available.

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