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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]    
Balance at January 1, 2017 [1] $ 24,205  
Discount on marketable securities, net (138) $ (212)
Proceeds from maturity of marketable securities (10,475) $ (3,625)
Balance at June 30, 2017 [1] $ 13,592  
[1] Including accrued interest in the amount of US$ 173 thousands and US$ 115 thousands as of December 31, 2016 and June 30, 2017 respectively.