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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net sales $ 274,053 $ 284,179
Cost of sales 141,661 156,913
Gross profit 132,392 127,266
Operating expenses:    
Selling expense 63,286 66,319
General and administrative expense 15,544 16,099
Research and development expense 8,234 7,916
Total operating expenses 87,064 90,334
Income from operations 45,328 36,932
Interest income 162 71
Interest expense (783) (2,092)
Other income (expense), net (4,916) 2,546
Income before income taxes 39,791 37,457
Income tax provision 1,401 1,638
Net income $ 38,390 $ 35,819
Earnings per common share:    
Basic (in dollars per share) $ 0.41 $ 0.46
Diluted (in dollars per share) $ 0.40 $ 0.39
Weighted-average common shares outstanding:    
Basic (in shares) 93,952 77,753
Diluted (in shares) 95,424 93,896
Dividends paid per common share (usd per share) $ 0.01 $ 0.01