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Fair value measurements (goodwill and non-recurring asset impairment analyses) (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021 USD ($) reporting_units	Mar. 31, 2021 reporting_units	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) reporting_units	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)
Goodwill impairment and non-recurring fair value measurements [Line Items]
Goodwill impairment charges	$ 0			$ 71,449
Goodwill	1,439,303				$ 1,439,303		$ 702,958
Total impairment charge	$ 0		$ 4,883		0	$ 98,989
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	$ 904,473				904,473		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	$ 59,202				$ 59,202		$ 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						7,110
Other assets			11,210			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								$ 7,622
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%
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								1.90%
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%
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				$ 2,752
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			$ 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								$ 7,622
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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