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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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.

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