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SEGMENT REPORTING (Schedule of Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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