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Consolidated Statements of Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales | $ 379,389 | $ 382,071 | $ 406,150
Cost of products sold | 280,644 | 290,046 | 313,570
Gross profit | 98,745 | 92,025 | 92,580
Selling, general and administrative expenses | 56,789 | 54,528 | 56,189
Impairment of goodwill and other intangible assets | 4,098 | 1,800 |
Operating income | 37,858 | 35,697 | 36,391
Other income, net | 1,520 | 785 | 875
Income before income taxes | 39,378 | 36,482 | 37,266
Income taxes | 12,823 | 11,599 | 12,157
Net income | $ 26,555 | $ 24,883 | $ 25,109
Earnings per share (in dollars per share) | $ 1.02 | $ 0.95 | $ 0.96
Average number of shares outstanding (in shares) | 26,100,865 | 26,087,721 | 26,192,072

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