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OTHER CONSOLIDATED BALANCE SHEET COMPONENTS (CURRENT) - Reserve for Transaction Losses (Details) - Transaction Losses - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Loss Contingency Accrual [Roll Forward]
Accrued transaction losses, beginning of the period	$ 48,480	$ 109,061	$ 70,557	$ 34,771
Provision for transaction losses	17,364	(4,549)	38,406	107,524
Charge-offs to accrued transaction losses	(18,107)	(17,577)	(61,226)	(55,360)
Accrued transaction losses, end of the period	$ 47,737	$ 86,935	$ 47,737	$ 86,935

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- Definition

Loss Contingency, Charge-Off And Recoveries

+ References

No definition available.

+ Details

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- Definition

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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