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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Balance | $ 32,266 | [1] | $ 50,810 |  |
Purchases of marketable securities | 3,998 |  | 19,927 |  | $ 6,558
Changes in marketable securities, net | (914) |  | (621) |  | (244)
Proceeds from maturity of marketable securities | (16,029) |  | (37,850) |  | (16,629)
Balance | $ 19,321 | [1] | $ 32,266 | [1] | $ 50,810
[1] | Including accrued interest in the amount of US$ 227 thousand and US$ 138 thousand as of December 31, 2021 and 2022, respectively.

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References No definition available. + Details
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