CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net sales	$ 842,801	$ 834,065	$ 886,528
Cost of sales	528,043	585,897	575,226
Gross profit	314,758	248,168	311,302
Selling expenses	226,496	268,088	265,325
General and administrative expenses	68,087	66,773	92,756
Research and development expenses	30,937	29,542	34,309
Total operating expenses	325,520	364,403	392,390
Loss from operations	(10,762)	(116,235)	(81,088)
Interest income	558	550	546
Interest expense	(9,123)	(5,513)	(1,618)
Other income (expense), net	6,005	3,152	(8,101)
Loss before income taxes	(13,322)	(118,046)	(90,261)
Income tax provision	5,599	4,900	81,559
Net loss	(18,921)	(122,946)	(171,820)
Dividends on convertible preferred stock	3,332	8,447	10,500
Net loss allocable to common shareholders	$ (22,253)	$ (131,393)	$ (182,320)
Loss per common share:
Basic, in dollars per share	$ (0.31)	$ (1.96)	$ (2.82)
Diluted, in dollars per share	$ (0.31)	$ (1.96)	$ (2.82)
Weighted-average common shares outstanding:
Basic, shares	72,809	67,061	64,601
Diluted, shares	72,809	67,061	64,601