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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

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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://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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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