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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, 2017 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segments | item |  | 1 |
Revenues | $ 332,033 | $ 293,641 | $ 349,435
Property and equipment | 29,870 | 27,560 |
North America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 39,498 | 40,236 | 45,934
Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 45,448 | 43,457 | 48,637
Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 12,111 | 19,872 | 34,642
Asia-Pacific and Middle East [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 44,983 | 29,743 | 31,929
India [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 130,042 | 80,247 | 105,990
Latin America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 59,951 | 80,086 | $ 82,303
Israel [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment | 25,419 | 23,162 |
Others [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment | $ 4,451 | $ 4,398 |

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