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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]      
Balance [1] $ 35,864    
Purchases of marketable securities 12,935 $ 11,740 $ 11,384
Discount on marketable securities, net (561) (758) (729)
Proceeds from maturity of marketable securities (15,100) (14,750) $ (12,500)
Balance [1] $ 33,138 $ 35,864  
[1] Including accrued interest in the amount of US$ 339 thousand and US$ 256 thousand as of December 31, 2014 and 2015 respectively.