Accumulated Other Comprehensive Income (Schedule of Reclassifications Out of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 367,545			$ 335,035			$ 1,095,549	$ 1,019,345
Interest expense	8,647			10,998			32,316	26,311
Tax expense	55,660			53,245			170,987	139,875
Gain (loss), net of tax	212,231	$ 224,236	$ 214,054	180,938	$ 131,979	$ 193,965	650,521	506,882
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	(119)			(141)			(470)	(452)
Tax expense	(21)			(23)			(75)	(74)
Gain (loss), net of tax	(98)			(118)			(395)	(378)
Foreign currency exchange contracts | Reclassification Out of Accumulated Other Comprehensive Income | Foreign currency exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	1,273			8,635			1,723	16,652
Tax expense	372			2,254			549	4,441
Gain (loss), net of tax	901			6,381			1,174	12,211
Interest rate swap contracts | Reclassification Out of Accumulated Other Comprehensive Income | Foreign currency exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense	1,385			0			1,668	0
Tax expense	329			0			396	0
Gain (loss), net of tax	$ 1,056			$ 0			$ 1,272	$ 0