GENERAL (Schedule of Unrealized Gains (Losses) on Derivatives) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Derivatives not designated as cash flow hedging instruments [Member] | Foreign exchange forward contracts [Member] | ||||
| Unrealized gain (loss) on derivatives | $ 66 | $ 975 | ||