Leases (Schedule Of Lease Expense Components) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 82,706	$ 74,701	$ 163,802	$ 151,506
Short-term lease cost		737	36	1,474
Variable lease cost	8,780	9,276	17,936	18,380
Sublease income	(812)	(909)	(1,649)	(1,675)
Total lease cost	$ 90,674	$ 83,805	$ 180,125	$ 169,685