Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Cash paid for operating lease liabilities	$ 84,008	$ 74,520	$ 228,492	$ 219,924
Operating lease assets obtained in exchange for operating lease liabilities	129,387	153,653	368,466	2,619,699
Derecognition of operating lease assets due to terminations or impairment	$ 1,777	$ 832	$ 16,194	$ 13,985