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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Balance [1] $ 33,138    
Discount on marketable securities, net (358) $ (561) $ (758)
Proceeds from maturity of marketable securities (8,575) (15,100) $ (14,750)
Balance [1] $ 24,205 $ 33,138  
[1] Including accrued interest in the amount of US$ 256 thousand and US$ 173 thousand as of December 31, 2015 and 2016 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.