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GENERAL (Narratives) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Aug. 31, 2014 | May 31, 2014 | Jan. 19, 2011 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 28, 2016 | Oct. 01, 2015 | Mar. 31, 2013
General [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring expenses |  |  |  |  |  | $ 1,225 | $ 6,816 |  |  |
Maturity date |  |  |  |  | Mar. 14, 2016 |  |  |  |  |
Line of credit outstanding amount |  |  |  |  | $ 17,000 | 34,922 |  |  |  |
Maximum borrowing capacity under the credit agreement |  |  |  |  | 50,200 | 56,000 |  |  |  |
Total proceeds from public offering |  | $ 45,149 |  |  |  |  | 45,149 |  |  |
Net income (loss) |  |  |  |  | 11,429 | 1,011 | (76,479) |  |  |
Net cash provided by operating activities |  |  |  |  | $ 25,771 | 16,121 | (32,279) |  |  |
Cash and cash equivalents and short-term investments |  |  |  |  |  | 36,318 |  |  |  |
Venezuela [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, short-term bank deposits and short and long-term marketable securities |  |  |  |  |  | 1,039 |  |  |  |
Elteck Asa [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Proceed from previous acquisition, net of associated legal expenses |  |  | $ 16,800 |  |  |  |  |  |  |
Nera Networks [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration for all shares |  |  |  | $ 57,175 |  |  |  |  |  |
Line Of Credit [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date | Jun. 30, 2016 |  |  |  |  |  |  |  |  |
Line of credit outstanding amount |  |  |  |  |  |  |  |  |  | $ 73,500
Maximum bank guarantees |  |  |  |  |  |  |  |  |  | $ 40,200
Line of credit reduction |  |  |  |  |  | 56,000 |  | $ 50,000 |  |
Line Of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Cash covenant amount |  |  |  |  |  |  |  |  | $ 20,000 |
Line Of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Cash covenant amount |  |  |  |  |  |  |  |  | $ 15,000 |
Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring expenses |  |  |  |  |  | 1,225 | 5,838 |  |  |
Restructuring reserve |  |  |  |  |  | $ 42 | 2,427 |  |  |
Previous Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring expenses |  |  |  |  |  |  | $ 978 |  |  |

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