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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Marketable Securities [Abstract]    
Balance at January 1, 2015 [1] $ 35,864  
Purchases of marketable securities 12,935 $ 9,990
Discount of marketable securities (298) (422)
Proceeds from maturity of marketable securities (10,200) $ (10,000)
Balance at June 30, 2015 [1] $ 38,301  
[1] Including accrued interest in the amount of US$ 339 thousands and US$ 315 thousands as of December 31, 2014 and June 30, 2015 respectively.