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Stock Plans - Stock-based compensation (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based compensation expense
Total stock-based compensation expense before taxes	$ 2,000	$ 22,495	$ 34,178	$ 31,404
Tax benefit		3,921	11,108	10,130
Stock-based compensation cost related to non-vested equity awards not yet recognized as an expense		$ 54,200
Weighted-average period over which stock-based compensation cost related to non-vested equity awards is expected to be recognized		2 years 6 months
Severance costs		$ 1,100
ESPP Plan
Share-based compensation expense
Total stock-based compensation expense before taxes		382	817	624
Stock options
Share-based compensation expense
Total stock-based compensation expense before taxes		6,311	7,778	8,495
Restricted stock awards
Share-based compensation expense
Total stock-based compensation expense before taxes		15,802	25,583	22,285
Cost of revenues
Share-based compensation expense
Total stock-based compensation expense before taxes		4,602	7,310	6,922
Research and development
Share-based compensation expense
Total stock-based compensation expense before taxes		6,030	8,891	7,461
Selling, general and administrative
Share-based compensation expense
Total stock-based compensation expense before taxes		$ 11,863	$ 17,977	$ 17,021

X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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