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MARKETABLE SECURITIES - Net realized gains and reclassification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt Securities, Available-for-sale [Abstract]
Net realized (loss) gain	$ (16)	$ 26	$ (36)	$ 38
Reclassification of net realized gains from other comprehensive income	$ (16)	$ 26	$ (36)	$ 38

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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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