Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Cash paid for operating lease liabilities		$ 77,889	$ 71,832
Operating lease assets obtained in exchange for operating lease liabilities	[1]	136,966	2,401,239
Derecognition of operating lease assets due to terminations or impairment		$ 2,007	$ 10,050

[1] Amounts for the three months ended March 31, 2019 include the transition adjustment for the adoption of Topic 842 discussed in our annual report on Form 10-K for the year ended December 31, 2019.