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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 60,616	$ 100,738
Accumulated Amortization	30,465	65,446
Net Carrying Value	30,151	35,292
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	0	16,200
Accumulated Amortization	0	16,200
Net Carrying Value	0	0
Merchant relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	20,208	22,193
Accumulated Amortization	9,236	8,268
Net Carrying Value	10,972	13,925
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	9,651	9,558
Accumulated Amortization	7,921	7,369
Net Carrying Value	1,730	2,189
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,121	3,651
Accumulated Amortization	1,863	2,685
Net Carrying Value	258	966
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	10,813	23,021
Accumulated Amortization	4,697	18,167
Net Carrying Value	6,116	4,854
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	17,823	26,115
Accumulated Amortization	6,748	12,757
Net Carrying Value	$ 11,075	$ 13,358

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