Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregated revenue information
Revenue	$ 562,953	$ 478,216	$ 1,118,968	$ 919,481
United States [Member]
Disaggregated revenue information
Revenue	533,275	448,181	1,056,497	858,339
Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	29,678	30,035	62,471	61,142
Reportable business segments [Member]
Disaggregated revenue information
Revenue	562,953	478,216	1,118,968	919,481
Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	171,154	103,339	337,362	182,777
Reportable business segments [Member] \| Payments [Member] \| United States [Member]
Disaggregated revenue information
Revenue	159,939	93,796	316,207	162,280
Reportable business segments [Member] \| Payments [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	11,215	9,543	21,155	20,497
Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	68,587	68,067	138,084	130,287
Reportable business segments [Member] \| Cloud Solutions [Member] \| United States [Member]
Disaggregated revenue information
Revenue	63,758	59,265	124,382	112,777
Reportable business segments [Member] \| Cloud Solutions [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	4,829	8,802	13,702	17,510
Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	139,276	134,987	272,519	259,494
Reportable business segments [Member] \| Promotional Solutions [Member] \| United States [Member]
Disaggregated revenue information
Revenue	132,886	129,321	260,128	248,469
Reportable business segments [Member] \| Promotional Solutions [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	6,390	5,666	12,391	11,025
Reportable business segments [Member] \| Checks [Member]
Disaggregated revenue information
Revenue	183,936	171,823	371,003	346,923
Reportable business segments [Member] \| Checks [Member] \| United States [Member]
Disaggregated revenue information
Revenue	176,692	165,799	355,780	334,813
Reportable business segments [Member] \| Checks [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	7,244	6,024	15,223	12,110
Checks [Member]
Disaggregated revenue information
Revenue	183,936	171,823	371,003	346,923
Checks [Member] \| Reportable business segments [Member] \| Checks [Member]
Disaggregated revenue information
Revenue	183,936	171,823	371,003	346,923
Merchant services and other payments solutions [Member]
Disaggregated revenue information
Revenue	111,619	47,115	219,889	67,417
Merchant services and other payments solutions [Member] \| Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	111,619	47,115	219,889	67,417
Forms and other products [Member]
Disaggregated revenue information
Revenue	69,404	78,194	139,720	149,975
Forms and other products [Member] \| Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	69,404	78,194	139,720	149,975
Marketing and promotional solutions [Member]
Disaggregated revenue information
Revenue	69,872	56,793	132,799	109,519
Marketing and promotional solutions [Member] \| Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	69,872	56,793	132,799	109,519
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	59,535	56,224	117,473	115,360
Treasury management solutions [Member] \| Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	59,535	56,224	117,473	115,360
Data-driven marketing solutions [Member]
Disaggregated revenue information
Revenue	45,470	39,518	87,313	73,164
Data-driven marketing solutions [Member] \| Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	45,470	39,518	87,313	73,164
Web and hosted solutions [Member]
Disaggregated revenue information
Revenue	23,117	28,549	50,771	57,123
Web and hosted solutions [Member] \| Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	$ 23,117	$ 28,549	$ 50,771	$ 57,123