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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Balance	[1]	$ 61,125
Purchases of marketable securities		6,558	$ 15,604	$ 41,670
Discount on marketable securities, net		(244)	(144)	(32)
Proceeds from maturity of marketable securities		(16,629)	(1,997)	$ (7,750)
Balance	[1]	$ 50,810	$ 61,125
[1] Including accrued interest in the amount of US$ 538 thousand and US$ 412 thousand as of December 31, 2019 and 2020, 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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