Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 337,500			$ 299,183			$ 981,259	$ 824,179
Tax expense (benefit)	43,772			17,633			128,698	77,376
Gain (loss), net of tax	175,178	$ 202,606	$ 204,289	146,321	$ 148,996	$ 111,856	582,073	407,173
Gain (loss) on derivative instruments classified as cash flow hedges included in net income, Foreign currency exchange contracts | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(1,583)			(591)			(6,728)	2,562
Tax expense (benefit)	(330)			(53)			(1,206)	526
Gain (loss), net of tax	$ (1,253)			$ (538)			$ (5,522)	$ 2,036