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Consolidated Statements of Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Net sales | $ 113,668 | $ 104,568 | $ 301,072 | $ 292,309
Cost of sales | 78,010 | 71,476 | 208,750 | 200,739
Gross profit | 35,658 | 33,092 | 92,322 | 91,570
Selling, general and administrative expenses | 13,034 | 10,400 | 35,535 | 29,874
Loss (gain) on disposal of assets | (1) | 0 | 46 | (20)
Income from operations | 22,625 | 22,692 | 56,741 | 61,716
Interest income, net | 84 | 82 | 215 | 223
Other income, net | 41 | (12) | 86 | 115
Income before taxes | 22,750 | 22,762 | 57,042 | 62,054
Income tax provision | 8,033 | 7,080 | 18,314 | 20,098
Net income | $ 14,717 | $ 15,682 | $ 38,728 | $ 41,956
Earnings per share: |  |  |  |
Basic (usd per share) | $ 0.28 | $ 0.30 | $ 0.74 | $ 0.79
Diluted (usd per share) | 0.28 | 0.29 | 0.73 | 0.78
Cash dividends declared per common share | $ 0 | $ 0 | $ 0.13 | $ 0.11
Weighted average shares outstanding: |  |  |  |
Basic (in shares) | 52,566,619 | 52,891,879 | 52,586,429 | 52,942,571
Diluted (in shares) | 53,014,269 | 53,394,331 | 53,103,408 | 53,467,023

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