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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Amortizable intangibles [Line Items]
Gross carrying amount	$ 1,110,502		$ 1,110,502		$ 1,166,934
Accumulated amortization	(752,687)		(752,687)		(775,190)
Net carrying amount	357,815		357,815		391,744
Amortization of intangibles	37,366	$ 36,859	73,064	$ 75,076
Estimated future amortization expense
Remainder of 2024	61,171		61,171
2025	88,178		88,178
2026	58,906		58,906
2027	36,071		36,071
2028	26,993		26,993
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	577,245		577,245		554,825
Accumulated amortization	(435,266)		(435,266)		(412,364)
Net carrying amount	141,979		141,979		142,461
Acquired intangibles			$ 37,710
Acquired intangibles, weighted-average useful life (in years)			3 years
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	346,890		$ 346,890		363,298
Accumulated amortization	(239,298)		(239,298)		(235,557)
Net carrying amount	107,592		107,592		127,741
Partner relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	75,100		75,100		74,911
Accumulated amortization	(16,050)		(16,050)		(14,031)
Net carrying amount	59,050		59,050		60,880
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	65,700		65,700		97,633
Accumulated amortization	(25,752)		(25,752)		(54,251)
Net carrying amount	39,948		39,948		43,382
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	39,367		39,367		39,367
Accumulated amortization	(31,516)		(31,516)		(23,792)
Net carrying amount	7,851		7,851		15,575
Trade names [Member] | Modification of useful life [Member]
Amortizable intangibles [Line Items]
Amortization of intangibles	6,674
Software to be sold [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	6,200		6,200		36,900
Accumulated amortization	(4,805)		(4,805)		(35,195)
Net carrying amount	$ 1,395		$ 1,395		$ 1,705

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