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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net sales $ 197,154 $ 193,433 $ 383,720 $ 374,634
Cost of sales 92,502 91,011 179,183 174,472
Gross profit 104,652 102,422 204,537 200,162
Selling and administrative expense 83,828 86,729 178,589 172,672
Research and development expense 8,041 8,009 15,659 16,267
Operating expenses 91,869 94,738 194,248 188,939
Income from operations 12,783 7,684 10,289 11,223
Other expense 0 0 0 2,942
Interest expense 4,398 3,757 8,518 7,587
Income before income taxes 8,385 3,927 1,771 694
Provision for income taxes 2,246 1,043 177 75
Net income 6,139 2,884 1,594 619
Comprehensive income $ 10,144 $ 1,345 $ 9,220 $ 2,132
Per share data:        
Basic (in dollars per share) $ 0.22 $ 0.10 $ 0.06 $ 0.02
Diluted (in dollars per share) 0.22 0.10 0.06 0.02
Dividends per share of common stock (in dollars per share) $ 0.20 $ 0.20 $ 0.40 $ 0.40
Weighted average common shares:        
Basic (shares) 27,891 27,776 27,894 27,753
Diluted (shares) 28,139 27,941 28,086 27,926