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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Balance | $ 50,810 | [1] | $ 61,125 |  |
Purchases of marketable securities | 19,927 |  | 6,558 |  | $ 15,604
Discount on marketable securities, net | (621) |  | (244) |  | (144)
Proceeds from maturity of marketable securities | (37,850) |  | (16,629) |  | (1,997)
Balance | $ 32,266 | [1] | $ 50,810 | [1] | $ 61,125
[1] | Including accrued interest in the amount of US$ 412 thousand and US$ 227 thousand as of December 31, 2020 and 2021, respectively.

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