Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments Not Designated) (Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 21,268	$ 2,104
Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	3	(238)
Foreign Exchange Forward [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2,958)	3,234
Other Contract [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 24,200	$ (892)