GOODWILL AND INTANGIBLE ASSETS - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross	$ 268,723	$ 268,723
Accumulated Amortization	(230,059)	(207,312)
Net	38,664	61,411
Acquired Internal-Use Software
Finite-Lived Intangible Assets [Line Items]
Gross	14,000	14,000
Accumulated Amortization	(14,000)	(14,000)
Net	0	0
Technology
Finite-Lived Intangible Assets [Line Items]
Gross	72,550	72,550
Accumulated Amortization	(68,662)	(61,262)
Net	3,888	11,288
Merchant Relationships
Finite-Lived Intangible Assets [Line Items]
Gross	181,586	181,586
Accumulated Amortization	(147,104)	(131,874)
Net	34,482	49,712
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross	587	587
Accumulated Amortization	(293)	(176)
Net	$ 294	$ 411