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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales $ 406,150 $ 434,925 $ 391,665
Cost of products sold 313,570 327,366 298,010
Gross profit 92,580 107,559 93,655
Selling, general and administrative expenses 56,189 54,254 51,734
Operating income 36,391 53,305 41,921
Other income 1,157 940 3,050
Other expense (282) (511) (694)
Income before income taxes 37,266 53,734 44,277
Income tax 12,157 17,593 14,173
Net income $ 25,109 $ 36,141 $ 30,104
Earnings per share (in dollars per share) $ 0.96 $ 1.38 $ 1.15
Average number of shares outstanding (in shares) 26,192,072 26,256,824 26,249,324