Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Total revenues	$ 147,968	$ 169,143
Cost of sales	57,041	62,872
Gross profit	90,927	106,271
Research and development	13,930	12,621
Sales and marketing	29,589	28,558
General and administrative	13,431	10,532
Acquisition and integration costs	2,824	3,467
Total operating expenses	59,774	55,178
Operating income	31,153	51,093
Interest expense, net	(4,582)	(7,850)
Loss on extinguishment of debt	0	(4,567)
Total other expense, net	(4,582)	(12,417)
Income before income taxes	26,571	38,676
Provision for income taxes	1,727	4,718
Net income	$ 24,844	$ 33,958
Basic (loss) earnings per share (in usd per share)	$ 0.63	$ 0.96
Diluted (loss) earnings per share (in usd per share)	$ 0.60	$ 0.86
Shares used in basic per share calculation (in shares)	39,704	35,236
Shares used in diluted per share calculation (in shares)	42,907	41,948