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Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net sales $ 238,263 $ 212,820 $ 456,641 $ 414,884
Cost of sales 107,073 96,549 204,013 189,056
Gross profit 131,190 116,271 252,628 225,828
Selling and administrative expense 100,726 89,604 199,952 174,172
Research and development expense 11,806 9,985 22,381 17,696
Operating expenses 112,532 99,589 222,333 191,868
Income from operations 18,658 16,682 30,295 33,960
Other expense 321 0 4,546 0
Interest expense 11,839 5,091 21,208 9,909
Income before income taxes 6,498 11,591 4,541 24,051
Provision (benefit) for income taxes 803 2,872 (2,175) 4,675
Net income 5,695 8,719 6,716 19,376
Comprehensive income $ 5,751 $ 7,307 $ 6,847 $ 20,709
Per share data:        
Basic (in dollars per share) $ 0.20 $ 0.31 $ 0.24 $ 0.69
Diluted (in dollars per share) $ 0.19 $ 0.30 $ 0.23 $ 0.67
Weighted average common shares:        
Basic (shares) 28,276 28,075 28,228 28,059
Diluted (shares) 29,337 28,846 29,197 28,739