Financial Instruments (Summary Of Gain (Loss) Recognized In AOCI, The Amount Reclassified Into Earnings And The Amount Gain Recognized In Income On Derivative (Amount Excluded From Effectiveness Testing)) (Details) - Cross Currency Swaps [Member] - Interest Expense [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Amount of Gain (Loss) Recognized in AOCL	$ 6,330	$ 7,243
Amount of Gain Recognized in Income of Derivative (Amount Excluded from Effectiveness Testing)	$ 3,688	$ 2,261