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Segment Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | segment 2  
Segment Reporting Information [Line Items]    
Operating revenues $ 314,998 $ 253,001
Operating expenses 238,618 191,625
Operating income 76,380 61,376
Account Services Segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenues 213,872  
Processing and Settlement Services Segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenues   101,126
Operating Segments [Member] | Account Services Segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenues 222,434 167,693
Operating expenses 169,488 126,677
Operating income 52,946 41,016
Operating Segments [Member] | Processing and Settlement Services Segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenues 101,858 93,710
Operating expenses 50,673 45,103
Operating income 51,185 48,607
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenues (9,294) (8,402)
Operating expenses 18,457 19,845
Operating income $ (27,751) $ (28,247)