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Stock Plans - Recognized Share-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recognized share-based compensation
Total	$ 16,074	$ 24,396	$ 15,713
Cost of sales
Recognized share-based compensation
Total	1,885	2,505	1,956
Research and development
Recognized share-based compensation
Total	3,611	2,957	3,324
Selling, general and administrative
Recognized share-based compensation
Total	9,417	12,851	$ 10,433
Restructuring
Recognized share-based compensation
Total	$ 1,161	1,880
Acquisition costs
Recognized share-based compensation
Total		$ 4,203

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- References

No definition available.

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