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Fair value measurements (goodwill and non-recurring asset impairment analyses) (Details) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) reporting_units	Mar. 31, 2021 reporting_units	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) reporting_units	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)
Goodwill impairment and non-recurring fair value measurements [Line Items]
Goodwill impairment charges		$ 0			$ 71,449
Goodwill	$ 1,435,483					$ 1,435,483		$ 702,958
Total impairment charge	0			$ 2,760		0	$ 101,749
Reportable business segments [Member] | Payments [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Number of reporting units | reporting_units		4	1
Goodwill	900,685					900,685		168,165
Reportable business segments [Member] | Promotional Solutions [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Number of reporting units | reporting_units		2	1
Goodwill	$ 59,170					$ 59,170		$ 59,165
Reporting units for which quantitative analysis completed [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Number of reporting units | reporting_units					2
Promotional Solutions reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Goodwill impairment charges					$ 67,132
Goodwill					59,009
Cloud Solutions Web Hosting reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Goodwill impairment charges					4,317
Non-recurring fair value measurement [Member] | Assets held for sale [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Asset impairment charges							7,514
Other assets									$ 11,210
Non-recurring fair value measurement [Member] | Small business distributors [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Estimated fair value, intangibles				$ 4,479			$ 4,479
Non-recurring fair value measurement [Member] | Small business distributors [Member] | Measurement input, revenue growth rate [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Intangibles fair value inputs				0.00%			0.00%
Non-recurring fair value measurement [Member] | Small business distributors [Member] | Measurement input, gross margin growth rate [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Intangibles fair value inputs				1.00%			1.00%
Non-recurring fair value measurement [Member] | Small business distributors [Member] | Measurement input, discount rate [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Intangibles fair value inputs				11.00%			11.00%
Non-recurring fair value measurement [Member] | Amortizable intangibles [Member] | Cloud Solutions Web Hosting reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Asset impairment charges					$ 17,678
Non-recurring fair value measurement [Member] | Amortizable intangibles [Member] | Cloud Solutions Web Hosting reporting unit [Member] | Measurement input, revenue growth rate [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Intangibles fair value inputs					(31.00%)
Non-recurring fair value measurement [Member] | Amortizable intangibles [Member] | Cloud Solutions Web Hosting reporting unit [Member] | Measurement input, gross margin growth rate [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Intangibles fair value inputs					(5.20%)
Non-recurring fair value measurement [Member] | Amortizable intangibles [Member] | Cloud Solutions Web Hosting reporting unit [Member] | Measurement input, discount rate [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Intangibles fair value inputs					9.00%
Non-recurring fair value measurement [Member] | Customer lists/relationships [Member] | Small business distributors [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Asset impairment charges				$ 2,356	$ 2,752		$ 5,108
Non-recurring fair value measurement [Member] | Customer lists/relationships [Member] | Cloud Solutions Web Hosting reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Asset impairment charges					8,397
Non-recurring fair value measurement [Member] | Internal-use software [Member] | Cloud Solutions Web Hosting reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Asset impairment charges					6,932
Estimated fair value, intangibles					2,172
Non-recurring fair value measurement [Member] | Other intangible assets [Member] | Cloud Solutions Web Hosting reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Asset impairment charges					2,349
Non-recurring fair value measurement [Member] | Significant unobservable inputs (Level 3) [Member] | Assets held for sale [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Other assets									$ 11,210
Non-recurring fair value measurement [Member] | Significant unobservable inputs (Level 3) [Member] | Small business distributors [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Estimated fair value, intangibles				$ 4,479			$ 4,479
Non-recurring fair value measurement [Member] | Significant unobservable inputs (Level 3) [Member] | Internal-use software [Member] | Cloud Solutions Web Hosting reporting unit [Member]
Goodwill impairment and non-recurring fair value measurements [Line Items]
Estimated fair value, intangibles					$ 2,172

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