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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net sales $ 233,590 $ 202,307 $ 690,232 $ 617,191
Cost of sales 103,479 91,680 307,492 280,736
Gross profit 130,111 110,627 382,740 336,455
Selling and administrative expense 98,187 84,983 298,140 259,156
Research and development expense 10,985 14,122 33,366 31,817
Operating expenses 109,172 99,105 331,506 290,973
Income from operations 20,939 11,522 51,234 45,482
Other expense 321 0 4,867 0
Interest expense 11,174 5,214 32,382 15,123
Income before income taxes 9,444 6,308 13,985 30,359
Provision for income taxes 2,474 483 299 5,158
Net income 6,970 5,825 13,686 25,201
Comprehensive income $ 4,661 $ 7,136 $ 11,508 $ 27,845
Per share data:        
Basic (in dollars per share) $ 0.25 $ 0.21 $ 0.48 $ 0.90
Diluted (in dollars per share) $ 0.23 $ 0.20 $ 0.47 $ 0.87
Weighted average common shares:        
Basic (shares) 28,353 28,124 28,280 28,096
Diluted (shares) 29,792 29,088 29,354 28,872