Segment Reporting and Major Customers - Total Assets by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting
Total assets	$ 7,531,717	$ 6,331,689
Operating Segments | Issuer Solutions
Segment Reporting
Total assets	6,911,399	5,735,195
Operating Segments | Merchant Solutions
Segment Reporting
Total assets	4,204,303	3,136,395
Operating Segments | Netspend
Segment Reporting
Total assets	1,428,399	1,418,644
Intersegment
Segment Reporting
Total assets	$ (5,012,384)	$ (3,958,545)