Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregated revenue information
Revenue	$ 537,844	$ 555,038	$ 1,654,896	$ 1,674,006
Reportable business segments [Member]
Disaggregated revenue information
Revenue	537,844	555,038	1,654,896	1,674,006
United States [Member]
Disaggregated revenue information
Revenue	513,455	528,449	1,574,507	1,584,946
Foreign, primarily Canada [Member]
Disaggregated revenue information
Revenue	24,389	26,589	80,389	89,060
Payments [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	169,482	169,787	515,837	507,149
Payments [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	156,556	159,160	478,441	475,368
Payments [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	12,926	10,627	37,396	31,781
Data Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	64,080	66,739	194,764	204,824
Data Solutions [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	64,080	64,111	189,037	188,494
Data Solutions [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	0	2,628	5,727	16,330
Promotional Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	124,292	136,081	399,234	408,600
Promotional Solutions [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	119,137	129,697	381,808	389,824
Promotional Solutions [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	5,155	6,384	17,426	18,776
Checks [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	179,990	182,431	545,061	553,433
Checks [Member] \| United States [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	173,682	175,481	525,221	531,260
Checks [Member] \| Foreign, primarily Canada [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	6,308	6,950	19,840	22,173
Checks [Member]
Disaggregated revenue information
Revenue	179,990	182,431	545,061	553,433
Checks [Member] \| Checks [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	179,990	182,431	545,061	553,433
Merchant services and other payments solutions [Member]
Disaggregated revenue information
Revenue	110,258	108,255	334,973	328,144
Merchant services and other payments solutions [Member] \| Payments [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	110,258	108,255	334,973	328,144
Marketing and promotional solutions [Member]
Disaggregated revenue information
Revenue	62,309	64,284	204,998	197,083
Marketing and promotional solutions [Member] \| Promotional Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	62,309	64,284	204,998	197,083
Forms and other products [Member]
Disaggregated revenue information
Revenue	61,983	71,797	194,236	211,517
Forms and other products [Member] \| Promotional Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	61,983	71,797	194,236	211,517
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	59,224	61,532	180,864	179,005
Treasury management solutions [Member] \| Payments [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	59,224	61,532	180,864	179,005
Data-driven marketing solutions [Member]
Disaggregated revenue information
Revenue	59,561	46,993	153,346	134,307
Data-driven marketing solutions [Member] \| Data Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	59,561	46,993	153,346	134,307
Web and hosted solutions [Member]
Disaggregated revenue information
Revenue	4,519	19,746	41,418	70,517
Web and hosted solutions [Member] \| Data Solutions [Member] \| Reportable business segments [Member]
Disaggregated revenue information
Revenue	$ 4,519	$ 19,746	$ 41,418	$ 70,517