Leases (Schedule Of Lease Expense Components) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 84,667	$ 77,483	$ 248,469	$ 228,989
Short-term lease cost		737	36	2,211
Variable lease cost	9,424	9,429	27,360	27,809
Sublease income	(1,033)	(886)	(2,682)	(2,561)
Total lease cost	$ 93,058	$ 86,763	$ 273,183	$ 256,448