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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues $ 332,033 $ 293,641 $ 349,435
Cost of revenues 224,698 194,479 246,487
Gross profit 107,335 99,162 102,948
Operating expenses:      
Research and development, net 25,703 21,695 22,930
Selling and marketing 41,656 39,515 40,816
General and administrative 18,576 20,380 21,235
Restructuring costs 1,225
Other income (1,746) (1,921) (4,849)
Total operating expenses 84,189 79,669 81,357
Operating income 23,146 19,493 21,591
Financial expenses, net 5,889 6,303 14,738
Income before taxes on income 17,257 13,190 6,853
Taxes on income 1,697 1,761 5,842
Net income $ 15,560 $ 11,429 $ 1,011
Net Income per share:      
Basic net income per share $ 0.20 $ 0.15 $ 0.01
Diluted net income per share $ 0.19 $ 0.15 $ 0.01
Weighted average number of ordinary shares used in computing basic net income per share 77,916,912 77,702,788 77,239,409
Weighted average number of ordinary shares used in computing diluted net income per share 79,942,353 78,613,528 77,296,681