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RELATED PARTY BALANCES AND TRANSACTIONS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Amount of surveys services | $ 490 |  |
Compass Networks [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash consideration | $ 833 |  |
Percentage of acquisitions | 11.00% |  |
Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Reimbursements for services provided | $ 1,856 | $ 1,857 | $ 1,668
Inventories [Member] | Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 78 | 1,325 | 2,866
Purchase Of Property And Equpment [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 148 | 224 | 1,019
Purchase Of Property And Equpment [Member] | Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 148 | 224 | 1,019
Rent And Maintenance [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | $ 1,960 | $ 1,849 | $ 1,963

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