Leases (Schedule Of Lease Expense Components) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost	$ 81,096	$ 76,805
Short-term lease cost	36	737
Variable lease cost	9,156	9,104
Sublease income	(837)	(766)
Total lease cost	$ 89,451	$ 85,880