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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net Sales $ 109,588 $ 101,326 $ 208,670 $ 187,404
Gross profit 27,585 31,678 42,975 56,664
Selling, general and administrative expenses 13,086 11,971 23,305 22,501
(Gain) loss on disposal of assets (4) 48 (11) 47
Income from operations 14,503 19,659 19,681 34,116
Interest income, net 67 71 135 131
Other (expense) income, net 12 34 6 45
Income before taxes 14,582 19,764 19,822 34,292
Income tax provision 2,891 5,970 3,871 10,281
Net income $ 11,691 $ 13,794 $ 15,951 $ 24,011
Earnings per share:        
Basic (usd per share) $ 0.22 $ 0.26 $ 0.30 $ 0.46
Diluted (usd per share) 0.22 0.26 0.30 0.45
Cash dividends declared per common share: $ 0.16 $ 0.13 $ 0.16 $ 0.13
Weighted average shares outstanding:        
Basic (in shares) 52,383,842 52,615,366 52,348,912 52,624,782
Diluted (in shares) 52,717,787 53,151,134 52,754,045 53,176,425
Product        
Net Sales $ 109,588 $ 101,326 $ 208,670 $ 187,404
Cost of sales $ 82,003 $ 69,648 $ 165,695 $ 130,740