Segment Reporting and Major Customers - Geographic Revenues to External Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Geographic revenues to external revenues by operating segment
Total revenues	$ 1,007,580	$ 1,222,375	$ 1,994,750	$ 2,407,100
United States
Geographic revenues to external revenues by operating segment
Total revenues	814,551	1,048,420	1,607,721	2,069,315
Europe
Geographic revenues to external revenues by operating segment
Total revenues	89,466	86,492	184,735	156,686
Canada
Geographic revenues to external revenues by operating segment
Total revenues	81,355	79,107	159,215	155,579
Other
Geographic revenues to external revenues by operating segment
Total revenues	22,208	8,356	43,079	25,520
Issuer Solutions
Geographic revenues to external revenues by operating segment
Total revenues	458,601	431,365	915,960	855,247
Issuer Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	266,274	258,120	530,306	518,849
Issuer Solutions | Europe
Geographic revenues to external revenues by operating segment
Total revenues	89,339	86,433	184,483	156,548
Issuer Solutions | Canada
Geographic revenues to external revenues by operating segment
Total revenues	81,076	78,761	158,657	154,956
Issuer Solutions | Other
Geographic revenues to external revenues by operating segment
Total revenues	21,912	8,051	42,514	24,894
Merchant Solutions
Geographic revenues to external revenues by operating segment
Total revenues	348,714	608,373	668,137	1,172,158
Merchant Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	348,012	607,663	666,762	1,170,771
Merchant Solutions | Europe
Geographic revenues to external revenues by operating segment
Total revenues	127	59	252	138
Merchant Solutions | Canada
Geographic revenues to external revenues by operating segment
Total revenues	279	346	558	623
Merchant Solutions | Other
Geographic revenues to external revenues by operating segment
Total revenues	296	305	565	626
Consumer Solutions
Geographic revenues to external revenues by operating segment
Total revenues	200,265	182,637	410,653	379,695
Consumer Solutions | United States
Geographic revenues to external revenues by operating segment
Total revenues	$ 200,265	$ 182,637	$ 410,653	$ 379,695