Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Cash paid for operating lease liabilities	$ 66,595	$ 73,572	$ 144,484	$ 145,404
Operating lease assets obtained in exchange for operating lease liabilities	102,113	64,807	239,079	2,466,046
Derecognition of operating lease assets due to terminations or impairment	$ 12,410	$ 3,103	$ 14,417	$ 13,859