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CUSTOMERS, GEOGRAPHIC AND SEGMENT INFORMATION (Schedule of Financial Data for Reportable Operating Segments) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]    
Revenues $ 121,794 $ 133,882
Cost of Revenues 76,239 90,053
Gross profit (loss) 45,555 43,829
Research and development, net 15,398 15,920
Selling and marketing 11,288 11,716
General and administrative 9,527 8,389
Operating income (loss) 9,342 7,804
Financial expenses, net 1,400 2,188
Income before taxes 7,942 5,616
Taxes on income (benefit) 1,713 1,154
Net income 6,229 4,462
Depreciation and amortization Expenses 5,681 7,322
Fixed Networks [Member]    
Segment Reporting Information [Line Items]    
Revenues 66,836 73,842
Cost of Revenues 39,821 46,595
Gross profit (loss) 27,015 27,247
Research and development, net 5,323 5,856
Selling and marketing 7,673 8,706
General and administrative 5,635 5,731
Operating income (loss) 8,384 6,954
Depreciation and amortization Expenses 3,304 3,365
Mobility Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenues 43,499 45,778
Cost of Revenues 22,983 26,279
Gross profit (loss) 20,516 19,499
Research and development, net 10,075 10,064
Selling and marketing 3,590 2,857
General and administrative 3,114 2,144
Operating income (loss) 3,737 4,434
Depreciation and amortization Expenses 2,340 3,898
Terrestrial Infrastructure Projects [Member]    
Segment Reporting Information [Line Items]    
Revenues 11,459 14,262
Cost of Revenues 13,435 17,179
Gross profit (loss) (1,976) (2,917)
Research and development, net
Selling and marketing 25 153
General and administrative 778 514
Operating income (loss) (2,779) (3,584)
Depreciation and amortization Expenses $ 37 $ 59