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Available-For-Sale Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2012
Available-For-Sale Marketable Securities [Abstract]  
Available-For-Sale Marketable Securities
                                 
   
December 31, 2012
 
   
Amortized cost
   
Gross unrealized gains
   
Gross unrealized losses
   
Fair value
 
Government debentures - fixed and floating interest rate
  $ 12,428       192       -     $ 12,620  
Corporate debentures - fix and floating interest rate
    36,901       594       (4 )     37,441  
    $ 49,329       786       (4 )   $ 50,111  
Contractual Maturities Of The Available-For-Sale Marketable Securities
         
   
December 31,
2012
2014                                                                                  
  $ 1,810  
2015                                                                                  
    9,735  
2016                                                                                  
    18,016  
2017                                                                                  
    13,659  
2018 and after                                                                                  
    2,920  
    $ 46,140