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SEGMENTS, CUSTOMERS AND GEOGRAPHIC INFORMATION (Schedule Of Revenues From Sales To Unaffiliated Customers) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segments | item | 1 |  |
Revenues | $ 285,583 | $ 343,874 | $ 332,033
Property and equipment | 34,865 | 33,613 |
North America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 42,474 | 41,384 | 39,498
Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 42,439 | 38,919 | 45,448
Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 25,614 | 23,690 | 12,111
Asia-Pacific and Middle East [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 53,948 | 47,320 | 44,983
India [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 49,748 | 131,201 | 130,042
Latin America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 71,360 | 61,360 | $ 59,951
Israel [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment | 29,165 | 28,494 |
Others [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment | $ 5,700 | $ 5,119 |

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