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