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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Balance	[1]	$ 47,662
Purchases of marketable securities		15,604	$ 41,670	$ 5,961
Discount on marketable securities, net		(144)	(32)	(217)
Proceeds from maturity of marketable securities		(1,997)	(7,750)	$ (16,175)
Balance	[1]	$ 61,125	$ 47,662
[1] Including accrued interest in the amount of US$ 450 thousand and US$ 538 thousand as of December 31, 2018 and 2019 respectively.

X

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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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