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Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Operating revenues	$ 258,349	$ 222,548	$ 573,347	$ 475,549
Operating expenses	231,168	202,357	469,786	393,982
Operating income	27,181	20,191	103,561	81,567
Account Services Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues	196,855		410,727
Operating income			91,463	74,594
Processing and Settlement Services Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues	61,494		162,620
Operating income			70,242	65,093
Operating Segments [Member] | Account Services Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues	204,265	175,114	426,699	342,807
Operating expenses	165,748	141,536	335,236	268,213
Operating income	38,517	33,578
Operating Segments [Member] | Processing and Settlement Services Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues	61,906	55,064	163,764	148,774
Operating expenses	42,849	38,578	93,522	83,681
Operating income	19,057	16,486
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues	(7,822)	(7,630)	(17,116)	(16,032)
Operating expenses	22,571	22,243	41,028	42,088
Operating income	$ (30,393)	$ (29,873)	$ (58,144)	$ (58,120)

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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