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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Marketable Securities [Abstract]      
Balance at January 1, 2014 $ 39,632us-gaap_HeldToMaturitySecurities [1]    
Purchases of marketable securities 11,740us-gaap_PaymentsToAcquireHeldToMaturitySecurities 11,384us-gaap_PaymentsToAcquireHeldToMaturitySecurities 17,992us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Discount of marketable securities (758)us-gaap_AmortizationOfDebtDiscountPremium (729)us-gaap_AmortizationOfDebtDiscountPremium (579)us-gaap_AmortizationOfDebtDiscountPremium
Proceeds from maturity of marketable securities (14,750)us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities (12,500)us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities (8,955)us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Balance at December 31, 2014 $ 35,864us-gaap_HeldToMaturitySecurities [1] $ 39,632us-gaap_HeldToMaturitySecurities [1]  
[1] Including accrued interest in the amount of US$ 391 thousand and US$ 339 thousand as of December 31, 2013 and 2014 respectively.