CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Total revenue, net	$ 357,082	$ 258,636
Costs and expenses:
Cost of goods sold	144,222	86,585
Research and development	18,325	15,494
Selling, general and administrative	163,566	142,497
Intangible asset amortization	5,390	4,101
Total costs and expenses	331,503	248,677
Operating income	25,579	9,959
Interest income	76	7
Interest expense	(18,768)	(5,131)
Other income (expense), net	2,245	(90)
Income before income taxes	9,132	4,745
Income tax benefit	(1,860)	(1,649)
Net income	$ 10,992	$ 6,394
Net income per share
Basic (in dollars per share)	$ 0.14	$ 0.09
Diluted (in dollars per share)	$ 0.14	$ 0.08
Weighted average common shares outstanding (See Note 12):
Basic (in shares)	78,552	74,765
Diluted (in shares)	79,834	78,394
Comprehensive income (See Note 13)	$ 32,604	$ 12,095