CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Total revenue, net	$ 250,332	$ 226,367	$ 736,411	$ 641,574
Costs and expenses:
Cost of goods sold	89,329	86,069	263,667	236,541
Research and development	15,124	13,938	44,254	37,029
Selling, general and administrative	112,317	113,424	343,510	306,007
Intangible asset amortization	3,467	2,942	10,410	6,418
Total costs and expenses	220,237	216,373	661,841	585,995
Operating income	30,095	9,994	74,570	55,579
Interest income	2	5	14	18
Interest expense	(6,295)	(6,464)	(19,255)	(17,421)
Other income (expense), net	1,192	1,827	(398)	2,984
Income from continuing operations before income taxes	24,994	5,362	54,931	41,160
Income tax expense	4,850	37,243	8,615	49,289
Income (loss) from continuing operations	20,144	(31,881)	46,316	(8,129)
Loss from discontinued operations (net of tax benefit)	0	0	0	(10,370)
Net income (loss)	$ 20,144	$ (31,881)	$ 46,316	$ (18,499)
Net income (loss) per share - basic:
Income from continuing operations (in dollars per share)	$ 0.54	$ (0.90)	$ 1.25	$ (0.24)
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.31)
Net income per share - basic (in dollars per share)	0.54	(0.90)	1.25	(0.55)
Net (loss) income per share - diluted:
Income from continuing operations (in dollars per share)	0.50	(0.90)	1.18	(0.24)
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.31)
Net income per share - diluted (in dollars per share)	$ 0.50	$ (0.90)	$ 1.18	$ (0.55)
Weighted average common shares outstanding:
Basic (in shares)	37,267	35,279	37,143	33,682
Diluted (in shares)	40,516	35,279	39,402	33,682
Comprehensive income (loss)	$ 23,410	$ (33,315)	$ 53,908	$ (36,734)