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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, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segments | item | 1 |  |
Revenues | $ 343,874 | $ 332,033 | $ 293,641
Property and equipment | 33,613 | 29,870 | 27,560
North America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 41,384 | 39,498 | 40,236
Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 38,919 | 45,448 | 43,457
Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 23,690 | 12,111 | 19,872
Asia-Pacific and Middle East [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 47,320 | 44,983 | 29,743
India [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 131,201 | 130,042 | 80,247
Latin America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 61,360 | 59,951 | 80,086
Others [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment | 28,494 | 4,451 | 4,398
Israel [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment | $ 5,119 | $ 25,419 | $ 23,162

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