Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregated revenue information
Revenue	$ 555,038	$ 532,141	$ 1,674,006	$ 1,451,622
United States [Member]
Disaggregated revenue information
Revenue	528,449	502,282	1,584,946	1,360,623
Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	26,589	29,859	89,060	90,999
Reportable business segments [Member]
Disaggregated revenue information
Revenue	555,038	532,141	1,674,006	1,451,622
Reportable business segments [Member] | Payments [Member]
Disaggregated revenue information
Revenue	169,787	160,268	507,149	343,045
Reportable business segments [Member] | Payments [Member] | United States [Member]
Disaggregated revenue information
Revenue	159,160	150,594	475,368	312,874
Reportable business segments [Member] | Payments [Member] | Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	10,627	9,674	31,781	30,171
Reportable business segments [Member] | Cloud Solutions [Member]
Disaggregated revenue information
Revenue	66,739	69,497	204,824	199,784
Reportable business segments [Member] | Cloud Solutions [Member] | United States [Member]
Disaggregated revenue information
Revenue	64,111	60,778	188,494	173,555
Reportable business segments [Member] | Cloud Solutions [Member] | Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	2,628	8,719	16,330	26,229
Reportable business segments [Member] | Promotional Solutions [Member]
Disaggregated revenue information
Revenue	136,081	130,330	408,600	389,825
Reportable business segments [Member] | Promotional Solutions [Member] | United States [Member]
Disaggregated revenue information
Revenue	129,697	124,571	389,824	373,042
Reportable business segments [Member] | Promotional Solutions [Member] | Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	6,384	5,759	18,776	16,783
Reportable business segments [Member] | Checks [Member]
Disaggregated revenue information
Revenue	182,431	172,046	553,433	518,968
Reportable business segments [Member] | Checks [Member] | United States [Member]
Disaggregated revenue information
Revenue	175,481	166,339	531,260	501,152
Reportable business segments [Member] | Checks [Member] | Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	6,950	5,707	22,173	17,816
Checks [Member]
Disaggregated revenue information
Revenue	182,431	172,046	553,433	518,968
Checks [Member] | Reportable business segments [Member] | Checks [Member]
Disaggregated revenue information
Revenue	182,431	172,046	553,433	518,968
Merchant services and other payments solutions [Member]
Disaggregated revenue information
Revenue	108,255	103,014	328,144	170,431
Merchant services and other payments solutions [Member] | Reportable business segments [Member] | Payments [Member]
Disaggregated revenue information
Revenue	108,255	103,014	328,144	170,431
Forms and other products [Member]
Disaggregated revenue information
Revenue	71,797	68,646	211,517	218,622
Forms and other products [Member] | Reportable business segments [Member] | Promotional Solutions [Member]
Disaggregated revenue information
Revenue	71,797	68,646	211,517	218,622
Marketing and promotional solutions [Member]
Disaggregated revenue information
Revenue	64,284	61,684	197,083	171,203
Marketing and promotional solutions [Member] | Reportable business segments [Member] | Promotional Solutions [Member]
Disaggregated revenue information
Revenue	64,284	61,684	197,083	171,203
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	61,532	57,254	179,005	172,614
Treasury management solutions [Member] | Reportable business segments [Member] | Payments [Member]
Disaggregated revenue information
Revenue	61,532	57,254	179,005	172,614
Data-driven marketing solutions [Member]
Disaggregated revenue information
Revenue	46,993	41,956	134,307	115,120
Data-driven marketing solutions [Member] | Reportable business segments [Member] | Cloud Solutions [Member]
Disaggregated revenue information
Revenue	46,993	41,956	134,307	115,120
Web and hosted solutions [Member]
Disaggregated revenue information
Revenue	19,746	27,541	70,517	84,664
Web and hosted solutions [Member] | Reportable business segments [Member] | Cloud Solutions [Member]
Disaggregated revenue information
Revenue	$ 19,746	$ 27,541	$ 70,517	$ 84,664