Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregated revenue information
Revenue	$ 478,216	$ 410,405	$ 919,481	$ 896,828
United States [Member]
Disaggregated revenue information
Revenue	448,181	385,879	858,339	843,415
Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	30,035	24,526	61,142	53,413
Reportable business segments [Member]
Disaggregated revenue information
Revenue	478,216	410,405	919,481	896,828
Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	103,339	72,171	182,777	149,211
Reportable business segments [Member] \| Payments [Member] \| United States [Member]
Disaggregated revenue information
Revenue	93,796	64,230	162,280	132,588
Reportable business segments [Member] \| Payments [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	9,543	7,941	20,497	16,623
Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	68,067	53,897	130,287	129,842
Reportable business segments [Member] \| Cloud Solutions [Member] \| United States [Member]
Disaggregated revenue information
Revenue	59,265	46,091	112,777	114,161
Reportable business segments [Member] \| Cloud Solutions [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	8,802	7,806	17,510	15,681
Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	134,987	117,946	259,494	260,739
Reportable business segments [Member] \| Promotional Solutions [Member] \| United States [Member]
Disaggregated revenue information
Revenue	129,321	113,757	248,469	250,570
Reportable business segments [Member] \| Promotional Solutions [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	5,666	4,189	11,025	10,169
Reportable business segments [Member] \| Checks [Member]
Disaggregated revenue information
Revenue	171,823	166,391	346,923	357,036
Reportable business segments [Member] \| Checks [Member] \| United States [Member]
Disaggregated revenue information
Revenue	165,799	161,801	334,813	346,096
Reportable business segments [Member] \| Checks [Member] \| Foreign, primarily Canada and Australia [Member]
Disaggregated revenue information
Revenue	6,024	4,590	12,110	10,940
Checks [Member]
Disaggregated revenue information
Revenue	171,823	166,391	346,923	357,036
Checks [Member] \| Reportable business segments [Member] \| Checks [Member]
Disaggregated revenue information
Revenue	171,823	166,391	346,923	357,036
Forms and other products [Member]
Disaggregated revenue information
Revenue	78,194	75,431	149,975	157,243
Forms and other products [Member] \| Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	78,194	75,431	149,975	157,243
Marketing and promotional solutions [Member]
Disaggregated revenue information
Revenue	56,793	42,515	109,519	103,496
Marketing and promotional solutions [Member] \| Reportable business segments [Member] \| Promotional Solutions [Member]
Disaggregated revenue information
Revenue	56,793	42,515	109,519	103,496
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	56,224	54,793	115,360	111,660
Treasury management solutions [Member] \| Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	56,224	54,793	115,360	111,660
Merchant services and other payments solutions [Member]
Disaggregated revenue information
Revenue	47,115	17,378	67,417	37,551
Merchant services and other payments solutions [Member] \| Reportable business segments [Member] \| Payments [Member]
Disaggregated revenue information
Revenue	47,115	17,378	67,417	37,551
Data-driven marketing solutions [Member]
Disaggregated revenue information
Revenue	39,518	19,422	73,164	58,419
Data-driven marketing solutions [Member] \| Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	39,518	19,422	73,164	58,419
Web and hosted solutions [Member]
Disaggregated revenue information
Revenue	28,549	34,475	57,123	71,423
Web and hosted solutions [Member] \| Reportable business segments [Member] \| Cloud Solutions [Member]
Disaggregated revenue information
Revenue	$ 28,549	$ 34,475	$ 57,123	$ 71,423