CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Total revenue, net	$ 882,734	$ 796,717	$ 696,832
Costs and Expenses:
Cost of goods sold	326,542	302,946	279,548
Research and development	50,895	43,559	42,622
Selling, general and administrative	415,757	375,545	332,190
Intangible asset amortization	9,953	6,810	7,099
Total costs and expenses	803,147	728,860	661,459
Operating income	79,587	67,857	35,373
Interest income	13	168	4,933
Interest expense	(23,517)	(21,967)	(19,725)
Other income (expense), net	4,588	(492)	(1,795)
Income from continuing operations before income taxes	60,671	45,566	18,786
Provision (benefit) for income taxes	53,820	9,271	(3,241)
Net income from continuing operations	6,851	36,295	22,027
Loss from discontinued operations (net of tax benefit)	(10,370)	(2,291)	(43,094)
Net (loss) income	$ (3,519)	$ 34,004	$ (21,067)
Income from continuing operations	$ 0.20	$ 1.12	$ 0.78
Loss from discontinued operations	(0.30)	(0.07)	(1.52)
Net (loss) income per share - basic	(0.10)	1.05	(0.74)
Income from continuing operations	0.19	1.10	0.76
Loss from discontinued operations	(0.29)	(0.07)	(1.50)
Net (loss) income per share - diluted	$ (0.10)	$ 1.03	$ (0.74)
Weighted average common shares outstanding (See Note 12):
Basic (in shares)	34,495	32,432	28,416
Diluted (in shares)	35,677	32,960	28,802