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Consolidated Condensed Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net sales $ 248,827 $ 237,835 $ 736,665 $ 609,631
Cost of sales 106,521 104,137 324,485 284,845
Gross profit 142,306 133,698 412,180 324,786
Selling and administrative expense 104,736 94,380 307,476 274,721
Research and development expense 10,859 9,936 32,203 28,756
  Operating expenses 115,595 104,316 339,679 303,477
Income from operations 26,711 29,382 72,501 21,309
Interest expense 8,145 11,943 27,917 32,938
Other expense 1,127 89 1,127 266
Income (loss) before income taxes 17,439 17,350 43,457 (11,895)
Provision for income taxes 2,491 10,500 5,359 2,728
Net income (loss) 14,948 6,850 38,098 (14,623)
Comprehensive income (loss) $ 13,756 $ 8,976 $ 42,242 $ (16,858)
Per share data:        
Basic (in dollars per share) $ 0.51 $ 0.24 $ 1.31 $ (0.51)
Diluted (in dollars per share) $ 0.47 $ 0.23 $ 1.19 $ (0.51)
Weighted average common shares:        
Basic (shares) 29,179 28,583 29,097 28,529
Diluted (shares) 32,143 29,426 32,020 28,529