Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregated revenue information
Revenue	$ 571,686	$ 562,953	$ 1,117,051	$ 1,118,968
Reportable business segments [Member]
Disaggregated revenue information
Revenue	571,686	562,953	1,117,051	1,118,968
United States [Member]
Disaggregated revenue information
Revenue	543,500	533,275	1,061,052	1,056,497
Foreign, primarily Canada [Member]
Disaggregated revenue information
Revenue	28,186	29,678	55,999	62,471
Payments [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	174,372	171,154	346,355	337,362
Payments [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	162,422	159,939	321,886	316,207
Payments [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	11,950	11,215	24,469	21,155
Data Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	72,090	68,587	130,683	138,084
Data Solutions [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	69,211	63,758	124,956	124,382
Data Solutions [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	2,879	4,829	5,727	13,702
Promotional Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	138,800	139,276	274,942	272,519
Promotional Solutions [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	132,175	132,886	262,671	260,128
Promotional Solutions [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	6,625	6,390	12,271	12,391
Checks [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	186,424	183,936	365,071	371,003
Checks [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	179,692	176,692	351,539	355,780
Checks [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	6,732	7,244	13,532	15,223
Checks [Member]
Disaggregated revenue information
Revenue	186,424	183,936	365,071	371,003
Checks [Member] \| Checks [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	186,424	183,936	365,071	371,003
Merchant services and other payments solutions [Member]
Disaggregated revenue information
Revenue	113,206	111,619	224,715	219,889
Merchant services and other payments solutions [Member] \| Payments [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	113,206	111,619	224,715	219,889
Marketing and promotional solutions [Member]
Disaggregated revenue information
Revenue	72,037	69,872	142,689	132,799
Marketing and promotional solutions [Member] \| Promotional Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	72,037	69,872	142,689	132,799
Forms and other products [Member]
Disaggregated revenue information
Revenue	66,763	69,404	132,253	139,720
Forms and other products [Member] \| Promotional Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	66,763	69,404	132,253	139,720
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	61,166	59,535	121,640	117,473
Treasury management solutions [Member] \| Payments [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	61,166	59,535	121,640	117,473
Data-driven marketing solutions [Member]
Disaggregated revenue information
Revenue	54,503	45,470	93,785	87,313
Data-driven marketing solutions [Member] \| Data Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	54,503	45,470	93,785	87,313
Web and hosted solutions [Member]
Disaggregated revenue information
Revenue	17,587	23,117	36,898	50,771
Web and hosted solutions [Member] \| Data Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	$ 17,587	$ 23,117	$ 36,898	$ 50,771