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Fair Value Measurements And Marketable Securities (Schedule Of Fair Value Of Available-For-Sale Securities By Major Security) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities $ 3,883 $ 4,817
Level 1 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities 100 1,333
Level 2 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities 3,783 3,484
Bank Certificates Of Deposit [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities 3,783 2,524
Bank Certificates Of Deposit [Member] | Level 2 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities 3,783 2,524
U.S. Government Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities   1,384
U.S. Government Obligations [Member] | Level 1 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities   880
U.S. Government Obligations [Member] | Level 2 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities   504
Corporate Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities 100 453
Corporate Obligations [Member] | Level 1 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities 100 453
State And Municipal Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities   456
State And Municipal Bonds [Member] | Level 2 [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities   $ 456