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Consolidated Statements of Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Statement [Abstract] |  |  |  |
Net sales | $ 104,568 | $ 94,360 | $ 292,309 | $ 261,403
Cost of sales | 71,476 | 64,175 | 200,739 | 182,303
Gross profit | 33,092 | 30,185 | 91,570 | 79,100
Selling, general and administrative expenses | 10,400 | 10,062 | 29,874 | 27,579
Gain on disposal of assets | 0 | (34) | (20) | (59)
Income from operations | 22,692 | 20,157 | 61,716 | 51,580
Interest income, net | 82 | 14 | 223 | 87
Other (expense) income, net | (12) | (58) | 115 | (106)
Income before taxes | 22,762 | 20,113 | 62,054 | 51,561
Income tax provision | 7,080 | 6,862 | 20,098 | 18,781
Net income | $ 15,682 | $ 13,251 | $ 41,956 | $ 32,780
Earnings per share: |  |  |  |
Basic (usd per share) | $ 0.30 | $ 0.24 | $ 0.79 | $ 0.61
Diluted (usd per share) | 0.29 | 0.24 | 0.78 | 0.60
Cash dividends declared per common share | $ 0 | $ 0 | $ 0.11 | $ 0.11
Weighted average shares outstanding: |  |  |  |
Basic (in shares) | 52,891,879 | 54,209,942 | 52,942,571 | 54,160,649
Diluted (in shares) | 53,394,331 | 54,579,590 | 53,467,023 | 54,623,163

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