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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
Dec. 31, 2016
Dec. 31, 2015
Derivative Financial Instruments [Line Items]    
Asset Derivatives $ 667 $ 0
Liability Derivatives 785 11,785
Not Designated as Hedging Instrument [Member] | Interest rate swap agreements [Member] | Other Assets [Member]    
Derivative Financial Instruments [Line Items]    
Asset Derivatives 667 0
Liability Derivatives 0 0
Not Designated as Hedging Instrument [Member] | Interest rate swap agreements [Member] | Other liabilities [Member]    
Derivative Financial Instruments [Line Items]    
Asset Derivatives 0 0
Liability Derivatives 765 11,525
Not Designated as Hedging Instrument [Member] | Equity contracts [Member] | Other liabilities [Member]    
Derivative Financial Instruments [Line Items]    
Asset Derivatives 0 0
Liability Derivatives $ 20 $ 260