Basis Of Presentation (Schedule Of Other Operating Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other operating (income)/expense	$ (12,207)	$ (78)	$ 28,935	$ (9,001)
CARES Act Grant [Member]
Other operating (income)/expense	(8,805)		32,184
Incremental PTO [Member] | CARES Act Grant [Member]
Other operating (income)/expense			21,425
Hard Costs [Member] | CARES Act Grant [Member]
Other operating (income)/expense	6,945		$ 10,759
Incremental Medicare Cap [Member] | CARES Act Grant [Member]
Other operating (income)/expense	(2,250)
Lost Revenue [Member] | CARES Act Grant [Member]
Other operating (income)/expense	$ (13,500)