CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 222,738	$ 206,182
Cost of goods sold	158,518	142,269
Gross profit	64,220	63,913
Operating expenses
Selling, general and administrative	39,454	31,731
Research and development	18,149	13,309
Amortization of acquisition related intangible assets	5,131	1,922
Other operating expenses	31	48
Total operating expenses	62,765	47,010
Income from operations	1,455	16,903
Other income (expense)
Interest income	456	298
Interest expense	(2,512)	(1,064)
Gain on securities carried at fair value		71
Other expense	(1,436)	(244)
Total other income (expense)	(3,492)	(939)
(Loss) income before income taxes and noncontrolling interest	(2,037)	15,964
Income tax (benefit) provision	(552)	4,187
Net (loss) income	(1,485)	11,777
Less net income attributable to noncontrolling interest	(248)	(645)
Net (loss) income attributable to common stockholders	$ (1,733)	$ 11,132
(Loss) earnings per share attributable to common stockholders:
Basic	$ (0.04)	$ 0.23
Diluted	$ (0.04)	$ 0.23
Number of shares used in (loss) earnings per share computation:
Basic	48,288	47,667
Diluted	48,288	48,978