Business segment information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($) segment
Business segment information [Line Items]
Number of reportable business segments | segment			4	4
Revenue	$ 478,216	$ 410,405	$ 919,481	$ 896,828
Depreciation and amortization	(33,244)	(26,663)	(61,024)	(55,093)
Interest expense	(9,530)	(6,171)	(14,054)	(13,171)
Net income attributable to non-controlling interest	29	26	62	26
Asset impairment charges	0	(4,883)	0	(98,989)
Restructuring integration and other costs	(11,979)	(20,490)	(27,191)	(40,123)
CEO transition costs	0	(190)	0	(10)
Share-based compensation expense	(7,625)	(5,477)	(14,367)	(9,095)
Acquisition transaction costs	(15,843)	0	(18,608)	(9)
Certain legal-related (expense) benefit	(302)	0	(302)	2,164
Loss on sales of customer lists	0	(18)	0	(18)
Income (loss) before income taxes	18,968	19,952	52,483	(47,165)
Reportable business segments [Member]
Business segment information [Line Items]
Revenue	478,216	410,405	919,481	896,828
Adjusted EBITDA	141,609	126,320	278,395	261,164
Reportable business segments [Member] | Payments [Member]
Business segment information [Line Items]
Revenue	103,339	72,171	182,777	149,211
Adjusted EBITDA	21,199	15,583	39,528	33,606
Reportable business segments [Member] | Cloud Solutions [Member]
Business segment information [Line Items]
Revenue	68,067	53,897	130,287	129,842
Adjusted EBITDA	18,803	14,159	36,011	29,069
Reportable business segments [Member] | Promotional Solutions [Member]
Business segment information [Line Items]
Revenue	134,987	117,946	259,494	260,739
Adjusted EBITDA	21,416	13,854	39,131	25,051
Reportable business segments [Member] | Checks [Member]
Business segment information [Line Items]
Revenue	171,823	166,391	346,923	357,036
Adjusted EBITDA	80,191	82,724	163,725	173,438
Corporate [Member]
Business segment information [Line Items]
Adjusted EBITDA	$ (44,147)	$ (42,502)	$ (90,428)	$ (94,011)