Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Disaggregated revenue information
Revenue	$ 556,015	$ 441,264
United States [Member]
Disaggregated revenue information
Revenue	523,222	410,158
Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	32,793	31,106
Reportable business segments [Member]
Disaggregated revenue information
Revenue	556,015	441,264
Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	166,208	79,438
Reportable business segments [Member] \| Payments [Member] \| United States [Member]
Disaggregated revenue information
Revenue	156,268	68,484
Reportable business segments [Member] \| Payments [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	9,940	10,954
Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	69,497	62,220
Reportable business segments [Member] \| Cloud Solutions [Member] \| United States [Member]
Disaggregated revenue information
Revenue	60,624	53,512
Reportable business segments [Member] \| Cloud Solutions [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	8,873	8,708
Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	133,243	124,507
Reportable business segments [Member] \| Promotional Solutions [Member] \| United States [Member]
Disaggregated revenue information
Revenue	127,242	119,148
Reportable business segments [Member] \| Promotional Solutions [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	6,001	5,359
Reportable business segments [Member] \| Checks [Member]
Disaggregated revenue information
Revenue	187,067	175,099
Reportable business segments [Member] \| Checks [Member] \| United States [Member]
Disaggregated revenue information
Revenue	179,088	169,014
Reportable business segments [Member] \| Checks [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	7,979	6,085
Checks [Member]
Disaggregated revenue information
Revenue	187,067	175,099
Checks [Member] \| Reportable business segments [Member] \| Checks [Member]
Disaggregated revenue information
Revenue	187,067	175,099
Merchant services and other payments solutions [Member]
Disaggregated revenue information
Revenue	108,270	20,302
Merchant services and other payments solutions [Member] \| Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	108,270	20,302
Forms and other products [Member]
Disaggregated revenue information
Revenue	70,316	71,781
Forms and other products [Member] \| Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	70,316	71,781
Marketing and promotional solutions [Member]
Disaggregated revenue information
Revenue	62,927	52,726
Marketing and promotional solutions [Member] \| Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	62,927	52,726
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	57,938	59,136
Treasury management solutions [Member] \| Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	57,938	59,136
Data-driven marketing solutions [Member]
Disaggregated revenue information
Revenue	41,843	33,646
Data-driven marketing solutions [Member] \| Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	41,843	33,646
Web and hosted solutions [Member]
Disaggregated revenue information
Revenue	27,654	28,574
Web and hosted solutions [Member] \| Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	$ 27,654	$ 28,574