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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Balance | [1] | $ 47,662 |  |
Purchases of marketable securities |  | 15,604 | $ 41,670 | $ 5,961
Discount on marketable securities, net |  | (144) | (32) | (217)
Proceeds from maturity of marketable securities |  | (1,997) | (7,750) | $ (16,175)
Balance | [1] | $ 61,125 | $ 47,662 |
[1] | Including accrued interest in the amount of US$ 450 thousand and US$ 538 thousand as of December 31, 2018 and 2019 respectively.

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