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COMMITMENTS AND CONTINGENCIES - Deferred FI Implementation Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Deferred Financial Institution Costs [Roll Forward]
Beginning balance	$ 12,181	$ 12,425	$ 15,877	$ 13,625
Deferred costs	0	3,500	0	5,750
Recoveries through FI Share	1,157	1,344	(3,469)	(4,036)
Amortization	789	378	2,173	1,136
Ending balance	$ 10,235	$ 14,203	$ 10,235	$ 14,203

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- Definition

Contract with Customer, Asset, Deferred Financial Institution Implementation Costs

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- Definition

Contract with Customer, Asset, Deferred Financial Institution Implementation Costs Recoveries Through Financial Institution Share, Net

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- Definition

Deferred Financial Institution Costs [Roll Forward]

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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