CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Total Revenue	$ 210,084	$ 202,185	$ 616,439	$ 576,555
Costs and Expenses:
Cost of goods sold	79,548	78,651	232,497	216,410
Research and development	13,105	13,187	38,148	38,049
Selling, general and administrative	93,077	87,508	276,585	263,324
Intangible asset amortization	4,618	4,548	13,985	11,609
Total costs and expenses	190,348	183,894	561,215	529,392
Operating income	19,736	18,291	55,224	47,163
Interest income	100	154	893	354
Interest expense	(5,549)	(7,587)	(20,581)	(19,778)
Other income (expense), net	(31)	429	(118)	379
Income before income taxes	14,256	11,287	35,418	28,118
Income tax (benefit) expense	1,045	44	7,000	4,689
Net income	13,211	11,243	28,418	23,429
Basic net income per common share (in dollars per share)	$ 0.46	$ 0.39	$ 1.00	$ 0.80
Diluted net income per common share (in dollars per share)	$ 0.46	$ 0.39	$ 0.99	$ 0.79
Weighted average common shares outstanding (See Note 12):
Basic (in shares)	28,446	28,583	28,403	29,234
Diluted (in shares)	28,777	29,029	28,629	29,820
Comprehensive income (loss) (See Note 13)	$ 17,106	$ (7,894)	$ 28,016	$ 21,945