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Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - Non-hedging derivatives [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Liability Derivatives $ 3,028 $ 4,854
Option contracts [Member] | Other liabilities [Member]    
Derivative [Line Items]    
Liability Derivatives 716 3
Total Return Swap [Member] | Other liabilities [Member]    
Derivative [Line Items]    
Liability Derivatives $ 2,312 $ 4,851