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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Revenues $ 279,551 $ 197,543 $ 235,133
Cost of Revenues   143,318 151,498
Impairment of long lived assets 10,137
Gross profit (loss) 75,490 44,088 83,635
Research and development, net 24,853 22,412 25,158
Selling and marketing 23,411 24,823 32,537
General and administrative 26,471 18,644 20,903
Restructuring costs 1,508
Goodwill impairment 20,402
Operating income (loss) 755 (43,701) 5,037
Financial expenses, net (4,843) (7,243) (3,837)
Income (loss) before taxes (4,088) (50,944) 1,200
Taxes on income 1,252 1,190 1,901
Loss from continuing operations (5,340) (52,134) (701)
Loss from discontinued operations (200) (795)
Loss (5,340) (52,334) (1,496)
Depreciation and amortization expenses 13,108 15,072 15,951
Commercial [Member]      
Segment Reporting Information [Line Items]      
Revenues 94,001 100,935 130,306
Cost of Revenues 57,403 63,425 77,587
Impairment of long lived assets    
Gross profit (loss) 36,598 37,510 52,719
Research and development, net 12,599 14,175 17,084
Selling and marketing 17,153 16,839 23,401
General and administrative 10,657 6,622 7,808
Restructuring costs   1,078  
Goodwill impairment    
Operating income (loss) (3,811) (1,204) 4,426
Depreciation and amortization expenses 4,467 4,546 4,885
Mobility [Member]      
Segment Reporting Information [Line Items]      
Revenues 62,911 41,112 54,817
Cost of Revenues 40,962 30,715 37,023
Impairment of long lived assets    
Gross profit (loss) 21,949 10,397 17,794
Research and development, net 12,254 8,237 8,074
Selling and marketing 5,483 6,947 7,809
General and administrative 9,138 6,271 5,961
Restructuring costs   421  
Goodwill impairment   1,103  
Operating income (loss) (4,926) (31,881) (4,050)
Depreciation and amortization expenses 7,530 7,322 8,220
Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 122,639 55,496 50,010
Cost of Revenues 105,696 49,178 36,888
Impairment of long lived assets   10,137  
Gross profit (loss) 16,943 (3,819) 13,122
Research and development, net
Selling and marketing 775 1,037 1,327
General and administrative 6,676 5,751 7,134
Restructuring costs   9  
Goodwill impairment    
Operating income (loss) 9,492 (10,616) 4,661
Depreciation and amortization expenses $ 1,111 $ 3,204 $ 2,846