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Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Balance at January 1, 2019	[1]	$ 47,662
Purchases of marketable securities		12,754	$ 14,070
Discount on marketable securities, net		(70)	(40)
Proceeds from maturity of marketable securities		(397)	$ (7,750)
Balance at June 30, 2019	[1]	$ 59,949
[1] Including accrued interest in the amount of US$ 450 thousands and US$ 520 thousands as of December 31, 2018 and June 30, 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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