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CUSTOMERS, GEOGRAPHIC AND SEGMENT INFORMATION (Schedule of Financial Data for Reportable Operating Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 282,756 | $ 279,551 | $ 197,543
Cost of Revenues | 200,261 | 204,061 | 143,318
Impairment of long lived assets |  |  | 10,137
Gross profit (loss) | 82,495 | 75,490 | 44,088
Research and development, net | 28,014 | 24,853 | 22,412
Selling and marketing | 23,759 | 23,411 | 24,823
General and administrative | 19,861 | 26,471 | 18,644
Restructuring costs |  |  | 1,508
Goodwill impairment |  |  | 20,402
Operating income (loss) | 10,861 | 755 | (43,701)
Financial expenses, net | (4,307) | (4,843) | (7,243)
Income (loss) before taxes on income | 6,554 | (4,088) | (50,944)
Taxes on income (benefit) | (247) | 1,252 | 1,190
Net income (loss) from continuing operations | 6,801 | (5,340) | (52,134)
Loss from discontinued operations |  |  | (200)
Net income (loss) | 6,801 | (5,340) | (52,334)
Depreciation and amortization expenses | 13,140 | 13,108 | 15,072
Commercial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 83,866 | 94,001 | 100,935
Cost of Revenues | 53,447 | 57,403 | 63,425
Impairment of long lived assets |  |  |
Gross profit (loss) | 30,419 | 36,598 | 37,510
Research and development, net | 12,172 | 12,599 | 14,175
Selling and marketing | 16,925 | 17,153 | 16,839
General and administrative | 6,016 | 10,657 | 6,622
Restructuring costs |  |  | 1,078
Goodwill impairment |  |  |
Operating income (loss) | (4,694) | (3,811) | (1,204)
Depreciation and amortization expenses | 3,600 | 4,467 | 4,546
Mobility [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 88,397 | 62,911 | 41,112
Cost of Revenues | 46,493 | 40,962 | 30,715
Impairment of long lived assets |  |  |
Gross profit (loss) | 41,904 | 21,949 | 10,397
Research and development, net | 15,842 | 12,254 | 8,237
Selling and marketing | 5,782 | 5,483 | 6,947
General and administrative | 6,326 | 9,138 | 6,271
Restructuring costs |  |  | 421
Goodwill impairment |  |  | 20,402
Operating income (loss) | 13,954 | (4,926) | (31,881)
Depreciation and amortization expenses | 7,902 | 7,530 | 7,322
Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 110,493 | 122,639 | 55,496
Cost of Revenues | 100,321 | 105,696 | 49,178
Impairment of long lived assets |  |  | 10,137
Gross profit (loss) | 10,172 | 16,943 | (3,819)
Research and development, net |  |  |
Selling and marketing | 1,052 | 775 | 1,037
General and administrative | 7,519 | 6,676 | 5,751
Restructuring costs |  |  | 9
Goodwill impairment |  |  |
Operating income (loss) | 1,601 | 9,492 | (10,616)
Depreciation and amortization expenses | $ 1,638 | $ 1,111 | $ 3,204

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