CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Total revenue, net	$ 282,164	$ 249,309	$ 540,801	$ 486,079
Costs and expenses:
Cost of goods sold	98,998	89,565	185,583	174,338
Research and development	15,747	14,679	31,241	29,130
Selling, general and administrative	145,015	119,217	287,512	231,192
Intangible asset amortization	5,419	3,471	9,520	6,943
Total costs and expenses	265,179	226,932	513,856	441,603
Operating income	16,985	22,377	26,945	44,476
Interest income	64	6	71	12
Interest expense	(6,181)	(6,588)	(11,312)	(12,961)
Other expense, net	(2,866)	(852)	(2,956)	(1,590)
Income before income taxes	8,002	14,943	12,748	29,937
Income tax (benefit) expense	(2,833)	2,188	(4,482)	3,764
Net income	$ 10,835	$ 12,755	$ 17,230	$ 26,173
Net income per share
Basic (in dollars per share)	$ 0.14	$ 0.17	$ 0.23	$ 0.35
Diluted (in dollars per share)	$ 0.14	$ 0.16	$ 0.22	$ 0.34
Weighted average common shares outstanding (See Note 10):
Basic (in shares)	76,213	74,392	75,487	74,074
Diluted (in shares)	78,963	78,710	78,703	77,542
Comprehensive income (See Note 11)	$ 28,131	$ 5,844	$ 40,226	$ 30,499