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Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Total return swap $ 7,600 $ 11,525
Non-hedging derivatives [Member]    
Derivative [Line Items]    
Asset Derivatives 0 0
Total return swap 7,909 11,785
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other Assets [Member]    
Derivative [Line Items]    
Asset Derivatives 0 0
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other liabilities [Member]    
Derivative [Line Items]    
Total return swap 7,600 11,525
Non-hedging derivatives [Member] | Equity contracts [Member] | Other Assets [Member]    
Derivative [Line Items]    
Asset Derivatives 0 0
Non-hedging derivatives [Member] | Equity contracts [Member] | Other liabilities [Member]    
Derivative [Line Items]    
Total return swap $ 309 $ 260