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MARKETABLE SECURITIES - Net realized gains and reclassification (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
MARKETABLE SECURITIES        
Net realized gain $ 16 $ 12 $ 30 $ 44
Reclassification of net realized gains from other comprehensive income $ 16 $ 12 $ (19) [1] $ (28) [1]
[1] Reported as part of interest income.