Segment Reporting and Major Customers - Total Assets by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting
Total assets	$ 7,466,490	$ 6,331,689
Operating Segments | Issuer Solutions
Segment Reporting
Total assets	6,961,342	5,735,195
Operating Segments | Merchant Solutions
Segment Reporting
Total assets	4,174,743	3,136,395
Operating Segments | Consumer Solutions
Segment Reporting
Total assets	1,391,672	1,418,644
Intersegment
Segment Reporting
Total assets	$ (5,061,267)	$ (3,958,545)