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GOODWILL AND LONG-LIVED ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 60,215	$ 60,616
Accumulated Amortization	32,687	30,465
Net Carrying Value	27,528	30,151
Merchant relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	20,498	20,208
Accumulated Amortization	11,125	9,236
Net Carrying Value	9,373	10,972
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	9,687	9,651
Accumulated Amortization	8,097	7,921
Net Carrying Value	1,590	1,730
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	554	2,121
Accumulated Amortization	554	1,863
Net Carrying Value	0	258
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	11,752	10,813
Accumulated Amortization	5,091	4,697
Net Carrying Value	6,661	6,116
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	17,724	17,823
Accumulated Amortization	7,820	6,748
Net Carrying Value	$ 9,904	$ 11,075

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