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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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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.

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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