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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Marketables Securities [Abstract]    
Balance at January 1, 2014 $ 39,632 [1]  
Purchases of marketable securities 9,990 5,703
Discount of marketable securities (422) (331)
Proceeds from maturity of marketable securities (10,000) (2,418)
Balance at June 30, 2014 $ 39,200 [1]  
[1] Including accrued interest in the amount of $391 thousand and $375 thousand as of December 31, 2013 and June 30, 2014 respectively.