Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 175,795	$ 356,676	$ 380,754	$ 638,583
Foreign currency translation adjustment and other (net of taxes (benefit) of $(151) and $(580) for the three and nine months ended September 30, 2021, and $351 and $688 for the three and nine months ended September 30, 2020, respectively)	(13,259)	9,611	(17,764)	(1,738)
Unrealized gain (loss) on cash flow hedge (net of taxes (benefit) of $748 and $2,993 for the three and nine months ended September 30, 2021, and $745 and $(5,937) for the three and nine months ended September 30, 2020, respectively)	2,273	2,265	9,099	(18,050)
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $5 and $(75) for the three and nine months ended September 30, 2021, and $(73) and $142 for the three and nine months ended September 30, 2020, respectively)	17	(220)	(227)	433
Comprehensive income	$ 164,826	$ 368,332	$ 371,862	$ 619,228