Segment Reporting and Major Customers - Geographic Revenues to External Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Geographic revenues to external revenues by operating segment
Total revenues	$ 987,170	$ 1,184,725
United States
Geographic revenues to external revenues by operating segment
Total revenues	793,169	1,020,895
Europe
Geographic revenues to external revenues by operating segment
Total revenues	95,268	70,195
Canada
Geographic revenues to external revenues by operating segment
Total revenues	77,861	76,471
Other
Geographic revenues to external revenues by operating segment
Total revenues	20,872	17,164
Issuer Solutions
Geographic revenues to external revenues by operating segment
Total revenues	457,359	423,881
Issuer Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	264,032	260,729
Issuer Solutions | Europe
Geographic revenues to external revenues by operating segment
Total revenues	95,143	70,115
Issuer Solutions | Canada
Geographic revenues to external revenues by operating segment
Total revenues	77,582	76,195
Issuer Solutions | Other
Geographic revenues to external revenues by operating segment
Total revenues	20,602	16,842
Merchant Solutions
Geographic revenues to external revenues by operating segment
Total revenues	319,423	563,786
Merchant Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	318,749	563,108
Merchant Solutions | Europe
Geographic revenues to external revenues by operating segment
Total revenues	125	80
Merchant Solutions | Canada
Geographic revenues to external revenues by operating segment
Total revenues	279	276
Merchant Solutions | Other
Geographic revenues to external revenues by operating segment
Total revenues	270	322
Netspend
Geographic revenues to external revenues by operating segment
Total revenues	210,388	197,058
Netspend | United States
Geographic revenues to external revenues by operating segment
Total revenues	$ 210,388	$ 197,058