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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement [Abstract] |  |
Net sales | $ 214,611 | $ 203,828
Cost of sales | 138,005 | 123,478
Gross margin | 76,606 | 80,350
Selling, general and administrative expenses | 40,597 | 34,569
Research and development expenses | 8,134 | 6,961
Restructuring and impairment charges | 422 | 725
Other operating (income) expense, net | (3,591) | (942)
Operating income | 31,044 | 39,037
Equity income in unconsolidated joint ventures | 1,007 | 1,009
Other income (expense), net | 66 | 1,119
Interest expense, net | (1,210) | (1,248)
Income before income tax expense | 30,907 | 39,917
Income tax expense | 4,771 | 12,885
Net income | $ 26,136 | $ 27,032
Basic earnings per share (in dollars per share) | $ 1.43 | $ 1.50
Diluted earnings per share (in dollars per share) | $ 1.40 | $ 1.47
Shares used in computing: |  |
Basic earnings per share (shares) | 18,288 | 18,056
Diluted earnings per share (shares) | 18,610 | 18,373

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