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COMMITMENTS AND CONTINGENT LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 31, 2018 | Mar. 31, 2018
Operating Leased Assets [Line Items] |  |  |  |  |
Bank guarantees | $ 72,842 | $ 43,914 |  |  | $ 29,100
Bank guarantee | 941 |  |  |  |
Down payment receivables |  |  |  | $ 29,100 |
Income from OCS grants | 1,174 | 1,548 | $ 2,536 |  |
Damages sought by plaintiff | 75,000 |  |  |  |
Facilities [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease expense | 4,979 | 4,675 | 4,235 |  |
Vehicles [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease expense | $ 862 | $ 814 | $ 735 |  |

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