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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Net sales $ 843,794 $ 886,945 $ 842,801
Cost of sales 486,161 529,019 528,043
Gross profit 357,633 357,926 314,758
Selling expenses 228,910 234,231 226,496
General and administrative expenses 68,567 61,662 68,087
Research and development expenses 33,213 31,285 30,937
Total operating expenses 330,690 327,178 325,520
Income (loss) from operations 26,943 30,748 (10,762)
Interest income 388 438 558
Interest expense (8,733) (9,499) (9,123)
Other income (expense), net 1,465 (48) 6,005
Income (loss) before income taxes 20,063 21,639 (13,322)
Income tax provision 5,495 5,631 5,599
Net income (loss) 14,568 16,008 (18,921)
Dividends on convertible preferred stock 0 0 3,332
Net income (loss) allocable to common shareholders $ 14,568 $ 16,008 $ (22,253)
Earnings (loss) per common share      
Basic (usd per share) $ 0.18 $ 0.21 $ (0.31)
Diluted (usd per share) $ 0.17 $ 0.20 $ (0.31)
Weighted-average common shares outstanding:      
Basic (usd per share) 83,116 77,559 72,809
Diluted (usd per share) 84,611 78,385 72,809
Dividends paid per common share $ 0.04 $ 0.04 $ 0.04