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Derivative Instruments And Hedging Activities (Summary Of Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Jul. 29, 2015
Interest Rate Swap Contracts [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivatives designated as hedging instruments under GAAP, Fair Value $ 116 $ 149 $ 237