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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (intangibles) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amortizable intangibles [Line Items]
Gross carrying amount		$ 1,282,568	$ 1,209,488
Accumulated amortization		(823,589)	(698,764)
Net carrying amount		458,979	510,724
Amortization of intangibles		146,555	123,142	$ 90,550
Acquired intangibles		$ 94,632	$ 384,655	$ 84,814
Weighted-average amortization period (in years)		4 years	8 years	6 years
Estimated future amortization expense
2023		$ 131,216
2024		91,800
2025		62,150
2026		40,686
2027		32,413
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount		529,306	$ 456,133
Accumulated amortization		(395,514)	(342,656)
Net carrying amount		133,792	113,477
Amortization of intangibles		54,925	41,601	$ 36,771
Acquired intangibles		$ 74,778	$ 75,918	$ 39,344
Weighted-average amortization period (in years)		3 years	3 years	4 years
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount		$ 497,882	$ 493,495
Accumulated amortization		(312,986)	(255,178)
Net carrying amount		184,896	238,317
Amortization of intangibles		70,712	61,805	$ 41,377
Acquired intangibles	[1]	$ 18,267	$ 149,642	$ 45,470
Weighted-average amortization period (in years)	[1]	6 years	8 years	7 years
Customer lists/relationships [Member] | Asset acquisitions [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		$ 18,267	$ 22,642	$ 45,470
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount		99,613	98,813
Accumulated amortization		(47,478)	(38,553)
Net carrying amount		52,135	60,260
Amortization of intangibles		8,925	10,940	6,291
Acquired intangibles		0	$ 65,000	0
Weighted-average amortization period (in years)			8 years
Partner relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount		74,682	$ 73,095
Accumulated amortization		(9,094)	(2,990)
Net carrying amount		65,588	70,105
Amortization of intangibles		6,104	2,990	0
Acquired intangibles		$ 1,587	$ 73,095	0
Weighted-average amortization period (in years)		3 years	15 years
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount		$ 44,185	$ 51,052
Accumulated amortization		(26,510)	(31,277)
Net carrying amount		17,675	19,775
Amortization of intangibles		1,992	1,580	1,884
Acquired intangibles		0	$ 21,000	0
Weighted-average amortization period (in years)			10 years
Software to be sold [Member]
Amortizable intangibles [Line Items]
Gross carrying amount		36,900	$ 36,900
Accumulated amortization		(32,007)	(28,110)
Net carrying amount		4,893	8,790
Amortization of intangibles		$ 3,897	$ 4,226	$ 4,227
[1] We acquired customer lists that did not qualify as business combinations of $18,267 during 2022, $22,642 during 2021 and $45,470 during 2020.

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