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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]      
Balance [1] $ 24,205    
Discount on marketable securities, net (217) $ (358) $ (561)
Proceeds from maturity of marketable securities (16,175) (8,575) $ (15,100)
Balance [1] $ 13,774 $ 24,205  
[1] Including accrued interest in the amount of US$ 173 thousand and US$ 77 thousand as of December 31, 2016 and 2017 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.