Revenue - Disaggregated Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of revenue
Revenue	$ 987,170
U.S. dollar
Disaggregation of revenue
Revenue	889,477
British Pound Sterling
Disaggregation of revenue
Revenue	63,121
Euro
Disaggregation of revenue
Revenue	26,597
Other
Disaggregation of revenue
Revenue	7,975
Volume-based revenues
Disaggregation of revenue
Revenue	727,940
Non-volume related revenues
Disaggregation of revenue
Revenue	259,230
Issuer Solutions
Disaggregation of revenue
Revenue	457,359
Issuer Solutions | U.S. dollar
Disaggregation of revenue
Revenue	359,870
Issuer Solutions | British Pound Sterling
Disaggregation of revenue
Revenue	63,121
Issuer Solutions | Euro
Disaggregation of revenue
Revenue	26,597
Issuer Solutions | Other
Disaggregation of revenue
Revenue	7,771
Issuer Solutions | Volume-based revenues
Disaggregation of revenue
Revenue	219,271
Issuer Solutions | Non-volume related revenues
Disaggregation of revenue
Revenue	238,088
Merchant Solutions
Disaggregation of revenue
Revenue	319,423
Merchant Solutions | U.S. dollar
Disaggregation of revenue
Revenue	319,219
Merchant Solutions | Other
Disaggregation of revenue
Revenue	204
Merchant Solutions | Volume-based revenues
Disaggregation of revenue
Revenue	298,948
Merchant Solutions | Non-volume related revenues
Disaggregation of revenue
Revenue	20,475
Netspend
Disaggregation of revenue
Revenue	210,388
Netspend | U.S. dollar
Disaggregation of revenue
Revenue	210,388
Netspend | Volume-based revenues
Disaggregation of revenue
Revenue	209,721
Netspend | Non-volume related revenues
Disaggregation of revenue
Revenue	$ 667