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MARKETABLE SECURITIES - Net realized gains and reclassification (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
MARKETABLE SECURITIES        
Net realized gain $ 14 $ 11 $ 14 $ 32
Reclassification of net realized gains from other comprehensive income $ 14 $ 11 $ 14 [1] $ 32 [1]
[1] Reported as part of interest income.