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RELATED PARTY BALANCES AND TRANSACTIONS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Reimbursements for services provided | $ 1,857 | $ 1,668 | $ 1,060
Inventories [Member] | Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 1,325 | 2,866 | 2,911
Purchase Of Property And Equpment [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 224 | 1,019 | 51
Purchase Of Property And Equpment [Member] | Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 224 | 1,019 | 51
Rent And Maintenance [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | $ 1,849 | $ 1,963 | $ 2,182

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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