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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Balance	[1]	$ 13,774
Purchases of marketable securities		41,670	$ 5,961
Discount on marketable securities, net		(32)	(217)	(358)
Proceeds from maturity of marketable securities		(7,750)	(16,175)	$ (8,575)
Balance	[1]	$ 47,662	$ 13,774
[1] Including accrued interest in the amount of US$ 77 thousand and US$ 450 thousand as of December 31, 2017 and 2018 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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