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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Balance | [1] | $ 61,125 |  |
Purchases of marketable securities |  | 6,558 | $ 15,604 | $ 41,670
Discount on marketable securities, net |  | (244) | (144) | (32)
Proceeds from maturity of marketable securities |  | (16,629) | (1,997) | $ (7,750)
Balance | [1] | $ 50,810 | $ 61,125 |
[1] | Including accrued interest in the amount of US$ 538 thousand and US$ 412 thousand as of December 31, 2019 and 2020, respectively.

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