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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Amortizable intangibles [Line Items]
Gross carrying amount	$ 1,117,153		$ 1,166,934
Accumulated amortization	(743,140)		(775,190)
Net carrying amount	374,013		391,744
Amortization of intangibles	35,698	$ 38,217
Estimated future amortization expense
Remainder of 2024	85,055
2025	87,044
2026	58,798
2027	37,871
2028	29,071
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	571,949		554,825
Accumulated amortization	(433,475)		(412,364)
Net carrying amount	138,474		142,461
Acquired intangibles	$ 17,095
Acquired intangibles, weighted-average amortization period (in years)	3 years
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	$ 359,375		363,298
Accumulated amortization	(242,420)		(235,557)
Net carrying amount	116,955		127,741
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	65,700		97,633
Accumulated amortization	(23,721)		(54,251)
Net carrying amount	41,979		43,382
Partner relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	74,562		74,911
Accumulated amortization	(14,557)		(14,031)
Net carrying amount	60,005		60,880
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	39,367		39,367
Accumulated amortization	(24,317)		(23,792)
Net carrying amount	15,050		15,575
Software to be sold [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	6,200		36,900
Accumulated amortization	(4,650)		(35,195)
Net carrying amount	$ 1,550		$ 1,705

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