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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Operations
Net sales	$ 484,756	$ 332,451	$ 477,038
Cost of sales	300,438	199,593	299,797
Gross profit	184,318	132,858	177,241
Operating expenses, net:
Research and development	81,987	81,016	78,543
Selling, general, and administrative	100,250	77,642	90,188
Amortization of intangible assets	35,475	19,219	27,634
Restructuring	11,851	5,640	4,679
Acquisition costs	17,786
Asset impairment	1,139	69,520	126
Other, net	(392)	223	(697)
Total operating expenses, net	248,096	253,260	200,473
Operating income (loss)	(63,778)	(120,402)	(23,232)
Interest income	2,335	1,180	1,050
Interest expense	(19,457)	(222)	(464)
Income (loss) before income taxes	(80,900)	(119,444)	(22,646)
Income tax expense (benefit)	(36,107)	2,766	9,332
Net income (loss)	$ (44,793)	$ (122,210)	$ (31,978)
Income (loss) per common share:
Basic (in dollars per share)	$ (1.01)	$ (3.11)	$ (0.80)
Diluted (in dollars per share)	$ (1.01)	$ (3.11)	$ (0.80)
Weighted average number of shares:
Basic (in shares)	44,174	39,340	39,742
Diluted (in shares)	44,174	39,340	39,742

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