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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Aggregate fair value | [1] | $ 31,788 |  | $ 51,312 |  |
Gross unrealized holding gains |  | 53 |  | 604 |  |
Gross unrealized holding (losses) |  | (531) |  | (102) |  |
Amortized cost basis |  | 32,266 | [2] | 50,810 | [2] | $ 61,125
Accrued interest on securities |  | 227 |  | 412 |  |
Current [Member] |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Aggregate fair value | [1] | 8,324 |  | 35,608 |  |
Gross unrealized holding gains |  | 43 |  | 265 |  |
Gross unrealized holding (losses) |  | (19) |  | (102) |  |
Amortized cost basis | [2] | 8,300 |  | 35,445 |  |
Non Current [Member] |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Aggregate fair value | [1] | 23,464 |  | 15,704 |  |
Gross unrealized holding gains |  | 10 |  | 339 |  |
Gross unrealized holding (losses) |  | (512) |  | 0 |  |
Amortized cost basis | [2] | $ 23,966 |  | $ 15,365 |  |
[1] | Fair value is being determined using Level 2 inputs.
[2] | 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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