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Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net sales $ 202,307 $ 190,117 $ 617,191 $ 573,837
Cost of sales 91,680 87,570 280,736 266,753
Gross profit 110,627 102,547 336,455 307,084
Selling and administrative expense 84,983 80,807 259,156 259,396
Research and development expense 14,122 8,270 31,817 23,929
Operating expenses 99,105 89,077 290,973 283,325
Income from operations 11,522 13,470 45,482 23,759
Interest expense 5,214 4,806 15,123 13,323
Income before income taxes 6,308 8,664 30,359 10,436
Provision for income taxes 483 1,467 5,158 1,645
Net income 5,825 7,197 25,201 8,791
Comprehensive income $ 7,136 $ 10,446 $ 27,845 $ 19,666
Per share data:        
Basic (in dollars per share) $ 0.21 $ 0.26 $ 0.90 $ 0.31
Diluted (in dollars per share) 0.20 0.26 0.87 0.31
Dividends per share of common stock (in dollars per share) $ 0.20 $ 0.20 $ 0.60 $ 0.60
Weighted average common shares:        
Basic (shares) 28,124 27,924 28,096 27,915
Diluted (shares) 29,088 28,183 28,872 28,124