GENERAL (Schedule of Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Derivative assets: | ||
| Derivative assets | $ 652 | $ 221 |
| Derivative liabilities: | ||
| Derivetive instrument fair value | (24) | (401) |
| Derivatives not designated as cash flow hedging instruments [Member] | Foreign exchange option contracts [Member] | ||
| Derivative assets: | ||
| Derivative assets | 340 | 221 |
| Derivative liabilities: | ||
| Derivative liabilities | (24) | (285) |
| Derivatives not designated as cash flow hedging instruments [Member] | Foreign exchange forward contracts [Member] | ||
| Derivative assets: | ||
| Derivative assets | 312 | |
| Derivative liabilities: | ||
| Derivative liabilities | $ (116) |