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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Marketables Securities [Abstract]      
Balance at January 1, 2013 $ 41,477 [1]    
Purchases of marketable securities 11,384 17,992 13,071
Discount of marketable securities (729) (579) (462)
Proceeds from maturity of marketable securities (12,500) (8,955) (9,531)
Balance at December 31, 2013 $ 39,632 [1] $ 41,477 [1]  
[1] Including accrued interest in the amount of $425K and $391K as of December 31, 2012 and 2013 respectively.