Intangible Assets - Definite-lived (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 517,145	$ 526,881
Accumulated Amortization	(353,309)	(317,678)
Net Carrying Amount	163,836	209,203
Merchant and Bank Branding Contracts / Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	481,986	490,332
Accumulated Amortization	(332,097)	(299,801)
Net Carrying Amount	149,889	190,531
Trade Name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,253	18,480
Accumulated Amortization	(8,961)	(7,091)
Net Carrying Amount	8,292	11,389
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,894	10,901
Accumulated Amortization	(6,140)	(5,230)
Net Carrying Amount	4,754	5,671
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,409	4,438
Accumulated Amortization	(4,401)	(4,308)
Net Carrying Amount	8	130
Deferred Financing Costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,603	2,730
Accumulated Amortization	(1,710)	(1,248)
Net Carrying Amount	$ 893	$ 1,482