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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 5,980 $ (3,672) $ 15,919 $ (4,883)
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion) 896 (216) 1,437 (625)
Interest Expense 34,079 32,967 68,416 63,659
Other Income 646 1,304 1,276 1,996
Interest Rate Swap [Member]        
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion) [1] 275 (913) 262 (1,984)
Cross Currency Swaps [Member]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 447 (209) 1,062 (375)
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion) [2] 621 697 1,175 1,359
Cross Currency Swap 2023 [Member]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (591) 0 (591) 0
Amount of Income (Expense) Reclassified from AOCI into Earnings (Effective Portion) 0 0 0 0
Currency Forward Agreements [Member]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 4,009 (3,166) 8,555 (4,715)
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) $ 2,115 $ (297) $ 6,893 $ 207
[1] (1)Included in "Interest expense, net" in the accompanying consolidated statements of income for the three and six months ended June 30, 2018 and 2017.
[2] Included in "Other income" in the accompanying consolidated statements of income for the three and six months ended June 30, 2018 and 2017.