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GOODWILL AND LONG-LIVED ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 60,670	$ 60,616
Accumulated Amortization	31,986	30,465
Net Carrying Value	28,684	30,151
Merchant relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	20,378	20,208
Accumulated Amortization	10,187	9,236
Net Carrying Value	10,191	10,972
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	9,671	9,651
Accumulated Amortization	8,009	7,921
Net Carrying Value	1,662	1,730
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,688	2,121
Accumulated Amortization	1,585	1,863
Net Carrying Value	103	258
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	11,104	10,813
Accumulated Amortization	4,859	4,697
Net Carrying Value	6,245	6,116
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	17,829	17,823
Accumulated Amortization	7,346	6,748
Net Carrying Value	$ 10,483	$ 11,075

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