Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments Not Designated) (Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ 301	$ 41,927	$ 21,268
Interest Rate Swap [Member] | Interest Expense [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	0	(1,444)	3
Foreign Exchange Forward [Member] | Other Nonoperating Income (Expense) [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	301	1,279	(2,958)
Other Contract [Member] | Other Nonoperating Income (Expense) [Member]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ 0	$ 42,092	$ 24,223