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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ 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 $ 180,041 $ 155,725 $ 520,407 $ 422,660
Cost of sales 140,061 117,532 396,750 316,100
Gross profit 39,980 38,193 123,657 106,560
Selling, product development and administrative expenses 24,819 19,896 73,697 59,062
Operating income 15,161 18,297 49,960 47,498
Interest expense 705 389 2,106 643
Other expense (income), net 408 (218) 1,147 (884)
Income before income taxes 14,048 18,126 46,707 47,739
Income tax expense 3,404 5,392 11,201 15,023
Loss (income) from equity method investment (31) (51) 37 (51)
Net income $ 10,675 $ 12,785 $ 35,469 $ 32,767
Earnings per share:        
Basic (in USD per share) $ 0.63 $ 0.76 $ 2.08 $ 1.94
Diluted (in USD per share) $ 0.62 $ 0.75 $ 2.05 $ 1.92
Weighted average number of common shares outstanding:        
Basic (shares) 17,055 16,888 17,028 16,859
Diluted (shares) 17,267 17,138 17,270 17,084