Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 32,707	$ 134,748	$ 204,959	$ 281,907
Foreign currency translation adjustment and other (net of taxes (benefit) of $250 and $(429) for the three and six months ended June 30, 2021, and $(88) and $337 for the three and six months ended June 30, 2020, respectively)	4,486	9,197	(4,505)	(11,349)
Unrealized gain (loss) on cash flow hedge (net of taxes (benefit) of $736 and $2,245 for the three and six months ended June 30, 2021, and $(332) and $(6,682) for the three and six months ended June 30, 2020, respectively)	2,238	(1,007)	6,826	(20,315)
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $(9) and $(80) for the three and six months ended June 30, 2021, and $494 and $215 for the three and six months ended June 30, 2020, respectively)	(27)	1,502	(244)	653
Comprehensive income	$ 39,404	$ 144,440	$ 207,036	$ 250,896