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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Balance | [1] | $ 13,774 |  |
Purchases of marketable securities |  | 41,670 | $ 5,961 |
Discount on marketable securities, net |  | (32) | (217) | (358)
Proceeds from maturity of marketable securities |  | (7,750) | (16,175) | $ (8,575)
Balance | [1] | $ 47,662 | $ 13,774 |
[1] | Including accrued interest in the amount of US$ 77 thousand and US$ 450 thousand as of December 31, 2017 and 2018 respectively.

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