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Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net sales $ 218,378 $ 202,064
Cost of sales 96,940 92,507
Gross profit 121,438 109,557
Selling and administrative expense 99,226 84,568
Research and development expense 10,575 7,711
Operating expenses 109,801 92,279
Income from operations 11,637 17,278
Other expense 4,225 0
Interest expense 9,369 4,818
Income (loss) before income taxes (1,957) 12,460
Provision (benefit) for income taxes (2,978) 1,803
Net income 1,021 10,657
Comprehensive income $ 1,096 $ 13,402
Per share data:    
Basic (in dollars per share) $ 0.04 $ 0.38
Diluted (in dollars per share) $ 0.04 $ 0.37
Weighted average common shares:    
Basic (shares) 28,173 28,008
Diluted (shares) 29,034 28,573