CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Total revenue, net	$ 236,770	$ 202,534
Costs and expenses:
Cost of goods sold	84,773	75,221
Research and development	14,451	11,079
Selling, general and administrative	111,956	93,265
Intangible asset amortization	3,471	1,729
Total costs and expenses	214,651	181,294
Operating income	22,119	21,240
Interest income	6	5
Interest expense	(6,373)	(5,472)
Other income (expense), net	(738)	2,017
Income from continuing operations before income taxes	15,014	17,790
Income tax expense	3,366	6,058
Income from continuing operations	11,648	11,732
Loss from discontinued operations (net of tax benefit)	0	(3,348)
Net income	$ 11,648	$ 8,384
Net income per share - basic:
Income from continuing operations (in dollars per share)	$ 0.32	$ 0.36
Loss from discontinued operations (in dollars per share)	0.00	(0.10)
Net income per share - basic (in dollars per share)	0.32	0.26
Net income per share - diluted:
Income from continuing operations (in dollars per share)	0.31	0.35
Loss from discontinued operations (in dollars per share)	0.00	(0.10)
Net income per share - diluted (in dollars per share)	$ 0.31	$ 0.25
Weighted average common shares outstanding:
Basic (in shares)	36,967	32,736
Diluted (in shares)	38,141	33,342
Comprehensive income (loss)	$ 22,885	$ (15,744)