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Marketable Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 3,719 $ 12,988
Gross unrealized gains 349 393
Fair market value 4,068 13,381
Corporate Debentures [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 204 204
Gross unrealized gains 99 15
Fair market value 303 219
Government Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,515 12,784
Gross unrealized gains 250 378
Fair market value $ 3,765 $ 13,162