CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Total revenue, net	$ 928,305	$ 836,214	$ 830,871
Costs and Expenses:
Cost of goods sold	352,801	327,045	314,427
Research and development	51,596	52,088	51,012
Selling, general and administrative	445,967	407,802	373,114
Intangible asset amortization	12,400	12,697	18,536
Goodwill impairment charge	0	46,738	0
Total costs and expenses	862,764	846,370	757,089
Operating income (loss)	65,541	(10,156)	73,782
Interest income	168	443	1,205
Interest expense	(21,967)	(19,788)	(22,237)
Other expense, net	(763)	(1,801)	(721)
Income (loss) before income taxes	42,979	(31,302)	52,029
Provision (benefit) for income taxes	8,975	(10,235)	10,825
Net income (loss)	$ 34,004	$ (21,067)	$ 41,204
Basic net income per common share (in dollars per share)	$ 1.05	$ (0.74)	$ 1.46
Diluted net income per common share (in dollars per share)	$ 1.03	$ (0.74)	$ 1.44
Weighted average common shares outstanding (See Note 11):
Basic (in shares)	32,432	28,416	28,232
Diluted (in shares)	32,960	28,416	28,516