CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Total revenue, net	$ 278,834	$ 250,332	$ 819,634	$ 736,411
Costs and expenses:
Cost of goods sold	101,757	89,329	287,340	263,667
Research and development	15,034	15,124	46,275	44,254
Selling, general and administrative	145,945	112,317	433,457	343,510
Intangible asset amortization	5,456	3,467	14,976	10,410
Total costs and expenses	268,192	220,237	782,048	661,841
Operating income	10,642	30,095	37,586	74,570
Interest income	89	2	160	14
Interest expense	(6,761)	(6,295)	(18,073)	(19,255)
Other (expense) income, net	(735)	1,192	(3,691)	(398)
Income before income taxes	3,235	24,994	15,982	54,931
Income tax expense (benefit)	76	4,850	(4,406)	8,615
Net income	$ 3,159	$ 20,144	$ 20,388	$ 46,316
Net income per share
Basic (in dollars per share)	$ 0.04	$ 0.27	$ 0.27	$ 0.62
Diluted (in dollars per share)	$ 0.04	$ 0.25	$ 0.26	$ 0.59
Weighted average common shares outstanding (See Note 10):
Basic (in shares)	78,186	74,534	76,387	74,286
Diluted (in shares)	79,455	81,032	78,973	78,804
Comprehensive income (See Note 11)	$ 13,534	$ 23,410	$ 53,759	$ 53,908