Intangible Assets - Definite-lived (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 539,162	$ 529,807
Accumulated Amortization	(454,533)	(415,882)
Net Carrying Amount	84,629	113,925
Merchant and bank-branding contracts/relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	496,634	489,363
Accumulated Amortization	(424,511)	(388,598)
Net Carrying Amount	72,123	100,765
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,262	18,391
Accumulated Amortization	(14,144)	(12,792)
Net Carrying Amount	6,118	5,599
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,003	12,389
Accumulated Amortization	(8,983)	(7,952)
Net Carrying Amount	3,020	4,437
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,442	4,408
Accumulated Amortization	(4,442)	(4,408)
Net Carrying Amount	0	0
Revolving credit facility deferred financing costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,821	5,256
Accumulated Amortization	(2,453)	(2,132)
Net Carrying Amount	$ 3,368	$ 3,124