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Marketable Securities (Schedule Of Maturities of Marketable Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Marketable Securities [Abstract]    
Amortized Cost, Due within one year $ 10,367  
Fair Value, Due within one year 10,435  
Amortized Cost, Due after one year through five years 22,789  
Fair Value, Due after one year through five years 23,212  
Amortized Cost, Due after five years through ten years 21,113  
Fair Value, Due after five years through ten years 21,589  
Amortized Cost, Equity securities 1,198  
Fair Value, Equity securities 8,685  
Amortized Cost 55,467 $ 58,937
Available-for-sale Securities, Fair Value, Total $ 63,921 $ 67,171