CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Total revenue, net	$ 258,636	$ 236,770
Costs and expenses:
Cost of goods sold	86,585	84,773
Research and development	15,494	14,451
Selling, general and administrative	142,497	111,975
Intangible asset amortization	4,101	3,471
Total costs and expenses	248,677	214,670
Operating income	9,959	22,100
Interest income	7	6
Interest expense	(5,131)	(6,373)
Other expense, net	(90)	(738)
Income before income taxes	4,745	14,995
Income tax (benefit) expense	(1,649)	1,576
Net income	$ 6,394	$ 13,419
Net income per share
Basic (in dollars per share)	$ 0.09	$ 0.18
Diluted (in dollars per share)	$ 0.08	$ 0.18
Weighted average common shares outstanding (See Note 10):
Basic (in shares)	74,765	73,934
Diluted (in shares)	78,394	76,466
Comprehensive income (See Note 11)	$ 12,095	$ 24,656