Derivative Instruments (Summary Of The Effect Of Derivative Instruments On The Consolidated Statements Of Changes In Equity And Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		$ (5,839)	$ 3,341	$ (10,722)	$ (12,277)
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion)		257	(674)	(368)	(2,013)
Interest Rate Swap [Member]
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion)	[1]	(263)	(1,317)	(2,247)	(3,970)
Cross Currency Swaps [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		(532)	279	(907)	(1,159)
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion)	[2]	520	643	1,879	1,957
Currency Forward Agreements [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		(5,417)	1,735	(10,132)	(5,819)
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion)		0	0	0	0
Interest Expense [Member] | Interest Rate Swap [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		$ 110	$ 1,327	$ 317	$ (5,299)

[1] (1)Included in "Interest expense, net" in the accompanying consolidated statements of income for the three and nine months ended September 30, 2017 and 2016.

[2] Included in "Other income" in the accompanying consolidated statements of income for the three and nine months ended September 30, 2017 and 2016.