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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Statement [Abstract] |  |  |  |  |
Net sales | [1] | $ 160,366 | $ 163,052 | $ 488,515 | $ 463,187
Cost of sales |  | 100,836 | 98,504 | 306,041 | 287,583
Gross margin |  | 59,530 | 64,548 | 182,474 | 175,604
Selling, general and administrative expenses |  | 29,190 | 30,182 | 98,363 | 92,279
Research and development expenses |  | 7,285 | 5,977 | 20,446 | 17,259
Operating income |  | 23,055 | 28,389 | 63,665 | 66,066
Equity income in unconsolidated joint ventures |  | 877 | 953 | 2,187 | 2,992
Other income (expense), net |  | (756) | (107) | (1,404) | (1,374)
Interest expense, net |  | (1,126) | (698) | (3,435) | (2,167)
Income before income tax expense |  | 22,050 | 28,537 | 61,013 | 65,517
Income tax expense |  | 9,595 | 8,149 | 21,392 | 19,647
Net income |  | $ 12,455 | $ 20,388 | $ 39,621 | $ 45,870
Basic earnings per share (in dollars per share) |  | $ 0.68 | $ 1.12 | $ 2.14 | $ 2.53
Diluted earnings per share (in dollars per share) |  | $ 0.67 | $ 1.09 | $ 2.10 | $ 2.46
Shares used in computing: |  |  |  |  |
Basic net income per share (shares) |  | 18,430 | 18,259 | 18,511 | 18,123
Diluted net income per share (shares) |  | 18,650 | 18,734 | 18,885 | 18,657
[1] | Net sales were allocated to countries based on the location of the customer.

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