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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Net sales $ 165,487 $ 129,700
Cost of sales 125,063 97,323
Gross profit 40,424 32,377
Selling, product development and administrative expenses 25,469 18,698
Operating income 14,955 13,679
Interest expense 606 144
Other expense (income), net 140 (167)
Income before income taxes 14,209 13,702
Income tax expense 2,494 4,533
Loss from equity method investment 46 0
Net income $ 11,669 $ 9,169
Earnings per share:    
Basic (in dollars per share) $ 0.69 $ 0.54
Diluted (in dollars per share) $ 0.68 $ 0.54
Weighted average number of common shares outstanding:    
Basic (shares) 16,983 16,825
Diluted (shares) 17,284 17,036