CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
Total revenue, net	$ 830,871	$ 780,078	$ 732,068
Costs and Expenses:
Cost of goods sold	314,427	299,150	268,188
Research and development	51,012	51,451	48,114
Selling, general and administrative	373,114	358,132	305,055
Intangible asset amortization	18,536	16,433	12,017
Total costs and expenses	757,089	725,166	633,374
Operating income	73,782	54,912	98,694
Interest income	1,205	465	225
Interest expense	(22,237)	(27,640)	(18,356)
Other income (expense), net	(721)	757	1,551
Income before income taxes	52,029	28,494	82,114
Provision for income taxes	10,825	505	16,445
Net income	$ 41,204	$ 27,989	$ 65,669
Basic net income per common share (in dollars per share)	$ 1.46	$ 0.97	$ 2.21
Diluted net income per common share (in dollars per share)	$ 1.44	$ 0.95	$ 2.17
Weighted average common shares outstanding (See Note 11):
Basic (in shares)	28,232	28,952	29,548
Diluted (in shares)	28,516	29,495	30,149