CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Total revenue, net	$ 233,665	$ 215,059
Costs and expenses:
Cost of goods sold	86,722	82,383
Research and development	12,556	12,567
Selling, general and administrative	114,064	108,338
Intangible asset amortization	3,535	3,033
Total costs and expenses	216,877	206,321
Operating income	16,788	8,738
Interest income	5	62
Interest expense	(5,492)	(5,142)
Other income, net	1,316	317
Income before income taxes	12,617	3,975
Income tax expense	4,233	1,769
Net income	8,384	2,206
Basic net income per common share (in dollars per share)	$ 0.26	$ 0.07
Diluted net income per common share (in dollars per share)	$ 0.25	$ 0.07
Weighted average common shares outstanding (See Note 10):
Basic (in shares)	32,736	32,275
Diluted (in shares)	33,342	32,768
Comprehensive (loss) income (See Note 11)	$ (15,744)	$ 3,206