MARKETABLE SECURITIES - Net realized gains and reclassification (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| MARKETABLE SECURITIES | ||
| Net realized (loss) gain | $ (19) | $ 10 |
| Reclassification of net realized (losses) gains from other comprehensive income | $ (19) | $ 10 |