CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Total revenue, net	$ 215,059	$ 196,652
Costs and Expenses:
Cost of goods sold	82,383	79,612
Research and development	12,567	12,716
Selling, general and administrative	108,338	102,963
Intangible asset amortization	3,033	3,551
Total costs and expenses	206,321	198,842
Operating income (loss)	8,738	(2,190)
Interest income	62	63
Interest expense	(5,142)	(4,800)
Other income (expense), net	317	(974)
Income (loss) before income taxes	3,975	(7,901)
Income tax expense (benefit)	1,769	(1,873)
Net income (loss)	2,206	(6,028)
Basic net income per common share (in dollars per share)	$ 0.07	$ (0.22)
Diluted net income per common share (in dollars per share)	$ 0.07	$ (0.22)
Weighted average common shares outstanding (See Note 11):
Basic (in shares)	32,275	27,796
Diluted (in shares)	32,768	27,796
Comprehensive income (loss) (See Note 12)	$ 3,206	$ (12,512)