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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (intangibles) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amortizable intangibles [Line Items]
Gross carrying amount	$ 1,166,934	$ 1,282,568
Accumulated amortization	(775,190)	(823,589)
Net carrying amount	391,744	458,979
Amortization of intangibles	146,277	146,555	$ 123,142
Acquired intangibles	$ 82,734	$ 94,632	$ 384,655
Weighted-average amortization period (in years)	4 years	4 years	8 years
Estimated future amortization expense
2024	$ 107,127
2025	75,217
2026	48,604
2027	37,075
2028	28,806
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	554,825	$ 529,306
Accumulated amortization	(412,364)	(395,514)
Net carrying amount	142,461	133,792
Acquired intangibles	$ 81,349	$ 74,778	$ 75,918
Weighted-average amortization period (in years)	4 years	3 years	3 years
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	$ 363,298	$ 497,882
Accumulated amortization	(235,557)	(312,986)
Net carrying amount	127,741	184,896
Acquired intangibles	0	$ 18,267	$ 149,642
Weighted-average amortization period (in years)		6 years	8 years
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	97,633	$ 99,613
Accumulated amortization	(54,251)	(47,478)
Net carrying amount	43,382	52,135
Acquired intangibles	0	0	$ 65,000
Weighted-average amortization period (in years)			8 years
Partner relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	74,911	74,682
Accumulated amortization	(14,031)	(9,094)
Net carrying amount	60,880	65,588
Acquired intangibles	$ 1,385	$ 1,587	$ 73,095
Weighted-average amortization period (in years)	2 years	3 years	15 years
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	$ 39,367	$ 44,185
Accumulated amortization	(23,792)	(26,510)
Net carrying amount	15,575	17,675
Acquired intangibles	0	0	$ 21,000
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	(35,195)	(32,007)
Net carrying amount	$ 1,705	$ 4,893

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