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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]    
Balance [1] $ 33,138  
Discount on marketable securities, net (212) $ (298)
Proceeds from maturity of marketable securities (3,625) $ (10,200)
Balance [1] $ 29,301  
[1] Including accrued interest in the amount of US$ 256 thousands and US$ 155 thousands as of December 31, 2015 and June 30, 2016 respectively.