Segment Reporting and Major Customers - Geographic Revenues to External Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Geographic revenues to external revenues by operating segment
Total revenues	$ 1,034,531	$ 987,170
United States
Geographic revenues to external revenues by operating segment
Total revenues	834,619	793,169
Europe
Geographic revenues to external revenues by operating segment
Total revenues	94,547	95,268
Canada
Geographic revenues to external revenues by operating segment
Total revenues	80,021	77,861
Other
Geographic revenues to external revenues by operating segment
Total revenues	25,344	20,872
Issuer Solutions
Geographic revenues to external revenues by operating segment
Total revenues	470,159	457,359
Issuer Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	271,130	264,032
Issuer Solutions | Europe
Geographic revenues to external revenues by operating segment
Total revenues	94,387	95,143
Issuer Solutions | Canada
Geographic revenues to external revenues by operating segment
Total revenues	79,633	77,582
Issuer Solutions | Other
Geographic revenues to external revenues by operating segment
Total revenues	25,009	20,602
Merchant Solutions
Geographic revenues to external revenues by operating segment
Total revenues	345,181	319,423
Merchant Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	344,298	318,749
Merchant Solutions | Europe
Geographic revenues to external revenues by operating segment
Total revenues	160	125
Merchant Solutions | Canada
Geographic revenues to external revenues by operating segment
Total revenues	388	279
Merchant Solutions | Other
Geographic revenues to external revenues by operating segment
Total revenues	335	270
Consumer Solutions
Geographic revenues to external revenues by operating segment
Total revenues	219,191	210,388
Consumer Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	$ 219,191	$ 210,388