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Consolidated Statements of Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Net sales | $ 405,232 | $ 383,977 | $ 358,632
Cost of sales | 281,835 | 265,897 | 249,951
Gross profit | 123,397 | 118,080 | 108,681
Selling, general and administrative expenses | 49,249 | 38,506 | 37,438
(Gain) loss on disposal of assets | 45 | (20) | (59)
Income from operations | 74,103 | 79,594 | 71,302
Interest income, net | 298 | 292 | 161
Other income (expense), net | 91 | 105 | (124)
Income before taxes | 74,492 | 79,991 | 71,339
Income tax provision | 19,994 | 26,615 | 25,611
Net income | $ 54,498 | $ 53,376 | $ 45,728
Earnings per share: |  |  |
Basic (usd per share) | $ 1.04 | $ 1.01 | $ 0.85
Diluted (usd per share) | 1.03 | 1.00 | 0.84
Cash dividends declared per common share | $ 0.26 | $ 0.24 | $ 0.22
Weighted average shares outstanding: |  |  |
Basic | 52,572,496 | 52,924,398 | 54,045,841
Diluted | 53,078,734 | 53,449,754 | 54,481,484

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