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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Amortizable intangibles [Line Items]
Gross carrying amount	$ 864,859		$ 834,033
Accumulated amortization	(610,707)		(587,273)
Net carrying amount	254,152		246,760
Acquired intangibles	$ 30,623
Acquired intangibles, weighted-average amortization period (in years)	5 years
Amortization of intangibles	$ 23,264	$ 23,511
Estimated future amortization expense
Remainder of 2021	65,583
2022	68,285
2023	48,720
2024	23,206
2025	17,327
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	397,675		380,144
Accumulated amortization	(314,125)		(303,422)
Net carrying amount	83,550		76,722
Acquired intangibles	$ 17,321
Acquired intangibles, weighted-average amortization period (in years)	3 years
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	$ 366,241		352,895
Accumulated amortization	(212,425)		(202,428)
Net carrying amount	153,816		150,467
Acquired intangibles	$ 13,302
Acquired intangibles, weighted-average amortization period (in years)	8 years
Software to be sold [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	$ 36,900		36,900
Accumulated amortization	(24,941)		(23,884)
Net carrying amount	11,959		13,016
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	33,813		33,813
Accumulated amortization	(29,163)		(27,613)
Net carrying amount	4,650		6,200
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	30,230		30,281
Accumulated amortization	(30,053)		(29,926)
Net carrying amount	$ 177		$ 355

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