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SELECTED QUARTERLY INFORMATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  | $ 108,249 |  | $ 111,255 | $ 107,563 | $ 104,688 | $ 102,436 | $ 101,625 | $ 97,571 | $ 88,036 | $ 431,755 | $ 389,668 | $ 344,609
Gross Profit |  | 54,028 |  | 55,713 | 53,447 | 50,476 | 50,076 | 49,842 | 47,785 | 44,488 | 213,664 | 192,191 | 173,300
Net income (loss) |  | $ (16,898) | [1] | $ 16,506 | $ 13,902 | $ 14,099 | $ 14,303 | $ 12,809 | $ 11,407 | $ 10,379 | $ 27,609 | $ 48,898 | $ 39,152
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ (0.57) |  | $ 0.55 | $ 0.47 | $ 0.48 | $ 0.49 | $ 0.44 | $ 0.40 | $ 0.36 | $ 0.93 | $ 1.69 | $ 1.35
Diluted | [2] | $ (0.57) |  | $ 0.54 | $ 0.46 | $ 0.47 | $ 0.48 | $ 0.43 | $ 0.39 | $ 0.35 | $ 0.90 | $ 1.65 | $ 1.32
Shares used in per share calculation |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 29,759 |  | 29,759 | 29,720 | 29,456 | 29,196 | 28,972 | 28,850 | 28,679 | 29,674 | 28,925 | 29,001
Diluted | [2] | 29,759 |  | 30,614 | 30,454 | 30,248 | 29,914 | 29,625 | 29,422 | 29,244 | 30,545 | 29,619 | 29,696
[1] | In December 2017 the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (Refer to Note 11, Provision for Income Taxes, in the Notes to Consolidated Financial Statements).
[2] | 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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