Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 172,252	$ 147,159
Foreign currency translation adjustment and other (net of taxes (benefit) of $(679) and $425, respectively)	(8,991)	(20,546)
Unrealized gain (loss) on cash flow hedge (net of taxes (benefit) of $1,509 and $(6,350), respectively)	4,588	(19,308)
Unrealized holding gain (loss) on available-for-sale investments (net of tax benefit of $71 and $279, respectively)	(217)	(849)
Comprehensive income	167,632	106,456
Foreign currency translation adjustment and other, taxes (benefit)	(679)	425
Unrealized loss on cash flow hedge, (taxes) benefit	(1,509)	6,350
Change in net unrealized holding gain (loss) on available-for-sale investments, (taxes) benefit	$ 71	$ 279