ACCUMULATED OTHER COMPREHENSIVE INCOME (Schedule of Reclassifications Out of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 379,505			$ 367,545			$ 1,134,949	$ 1,095,549
Tax benefit (expense)	66,068			55,660			181,726	170,987
Interest expense	7,697			8,647			23,707	32,316
General and administrative expense	91,887			89,034			341,154	248,804
Net income	232,841	$ 203,298	$ 235,579	212,231	$ 224,236	$ 214,054	671,718	650,521
Reclassification Out of Accumulated Other Comprehensive Income | Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax benefit (expense)	0			0			51	0
General and administrative expense	0			0			(214)	0
Net income	0			0			(163)	0
Reclassification Out of Accumulated Other Comprehensive Income | Defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(143)			(119)			(319)	(470)
Tax benefit (expense)	21			21			50	75
Net income	(122)			(98)			(269)	(395)
Foreign currency exchange contracts | Reclassification Out of Accumulated Other Comprehensive Income | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	512			1,273			3,043	1,723
Tax benefit (expense)	(176)			(372)			(899)	(549)
Net income	336			901			2,144	1,174
Interest rate swap contracts | Reclassification Out of Accumulated Other Comprehensive Income | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax benefit (expense)	(204)			(329)			(664)	(396)
Interest expense	860			1,385			2,796	1,668
Net income	$ 656			$ 1,056			$ 2,132	$ 1,272