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MARKETABLE SECURITIES - Net realized gains and reclassification (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
MARKETABLE SECURITIES
Net realized gain (loss)	$ 4	$ (19)
Reclassification of net realized gains (losses) from other comprehensive income	$ 4	$ (19)

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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