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SEGMENT REPORTING (Schedule of Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 234,636 | $ 199,574 | $ 175,628
Property and equipment, net | 39,047 | 35,644 | 31,514
IL [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 116,391 | 101,273 | 88,556
Property and equipment, net | 16,757 | 11,973 | 9,934
US [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 8,537 | 8,697 | 7,811
Property and equipment, net | 118 | 106 | 73
BR [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 89,455 | 70,982 | 58,403
Property and equipment, net | 17,969 | 19,188 | 17,228
AR [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 15,211 | 14,772 | 17,324
Property and equipment, net | 4,203 | 4,377 | 4,279
Other Foreign Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 5,042 | $ 3,850 | $ 3,534

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