CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Total revenue, net	$ 249,309	$ 212,673	$ 486,079	$ 415,207
Costs and expenses:
Cost of goods sold	89,565	75,251	174,338	150,472
Research and development	14,679	12,012	29,130	23,091
Selling, general and administrative	119,217	99,318	231,192	192,583
Intangible asset amortization	3,471	1,747	6,943	3,476
Total costs and expenses	226,932	188,328	441,603	369,622
Operating income	22,377	24,345	44,476	45,585
Interest income	6	8	12	13
Interest expense	(6,588)	(5,485)	(12,961)	(10,957)
Other income (expense), net	(852)	(860)	(1,590)	1,157
Income from continuing operations before income taxes	14,943	18,008	29,937	35,798
Income tax expense	2,188	5,988	3,764	12,046
Income from continuing operations	12,755	12,020	26,173	23,752
Loss from discontinued operations (net of tax benefit)	0	(7,022)	0	(10,370)
Net income	$ 12,755	$ 4,998	$ 26,173	$ 13,382
Net income per share - basic:
Income from continuing operations (in dollars per share)	$ 0.34	$ 0.36	$ 0.71	$ 0.72
Loss from discontinued operations (in dollars per share)	0.00	(0.21)	0.00	(0.32)
Net income per share - basic (in dollars per share)	0.34	0.15	0.71	0.40
Net income per share - diluted:
Income from continuing operations (in dollars per share)	0.32	0.35	0.68	0.71
Loss from discontinued operations (in dollars per share)	0.00	(0.21)	0.00	(0.31)
Net income per share - diluted (in dollars per share)	$ 0.32	$ 0.14	$ 0.68	$ 0.40
Weighted average common shares outstanding:
Basic (in shares)	37,196	33,032	37,037	32,884
Diluted (in shares)	39,355	33,939	38,771	33,644
Comprehensive income (loss)	$ 5,844	$ 12,325	$ 30,499	$ (3,418)