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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |  |
NET REVENUES |  | $ 431,755 | $ 389,668 | $ 344,609
COST OF REVENUES |  | 218,091 | 197,477 | 171,309
GROSS PROFIT |  | 213,664 | 192,191 | 173,300
OPERATING EXPENSES: |  |  |  |
Research and development |  | 68,501 | 62,310 | 57,549
Sales and marketing |  | 51,384 | 47,978 | 46,816
General and administrative |  | 36,142 | 33,029 | 30,029
Total operating expenses |  | 156,027 | 143,317 | 134,394
INCOME FROM OPERATIONS |  | 57,637 | 48,874 | 38,906
OTHER INCOME |  | 2,662 | 1,078 | 425
INCOME BEFORE INCOME TAXES |  | 60,299 | 49,952 | 39,331
PROVISION FOR INCOME TAXES |  | 32,690 | 1,054 | 179
NET INCOME |  | $ 27,609 | $ 48,898 | $ 39,152
EARNINGS PER SHARE: |  |  |  |
Basic |  | $ 0.93 | $ 1.69 | $ 1.35
Diluted | [1] | $ 0.90 | $ 1.65 | $ 1.32
SHARES USED IN PER SHARE CALCULATION: |  |  |  |
Basic |  | 29,674 | 28,925 | 29,001
Diluted | [1] | 30,545 | 29,619 | 29,696
[1] | The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has included in the 2017, 2016 and 2015 calculations those shares that were contingently issuable upon the satisfaction of the performance conditions as of the end of the respective periods.

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