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Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (in segments) | segment			2
Operating revenues	$ 230,577	$ 201,613	$ 803,924	$ 677,162
Operating expenses	235,662	188,561	705,448	582,543
Operating income	(5,085)	13,052	98,476	94,619
Account Services
Segment Reporting Information [Line Items]
Operating revenues	186,623		597,350
Operating income			135,350	109,061
Processing and Settlement Services
Segment Reporting Information [Line Items]
Operating revenues	43,954		206,574
Operating income			71,469	64,575
Operating segments | Account Services
Segment Reporting Information [Line Items]
Operating revenues	193,763	170,160	620,462	512,967
Operating expenses	149,876	135,693	485,112	403,906
Operating income	43,887	34,467
Operating segments | Processing and Settlement Services
Segment Reporting Information [Line Items]
Operating revenues	44,150	39,088	207,914	187,862
Operating expenses	42,923	39,606	136,445	123,287
Operating income	1,227	(518)
Corporate and Other
Segment Reporting Information [Line Items]
Operating revenues	(7,336)	(7,635)	(24,452)	(23,667)
Operating expenses	42,863	13,262	83,891	55,350
Operating income	$ (50,199)	$ (20,897)	$ (108,343)	$ (79,017)

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+ 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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