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Stockholders' Equity - Stock-based compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2017 | Dec. 31, 2016
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | $ 2,638 | $ 7,688 | $ 10,749 | $ 15,478 |  |
Tax benefit | 506 | 2,655 | 1,713 | 5,363 |  |
Accelerated stock award expense, restructuring termination as Type III modification | 1,100 |  |  |  |  |
Stock-based compensation cost related to non-vested equity awards not yet recognized as an expense | 59,200 |  | $ 59,200 |  |  |
Weighted-average period over which stock-based compensation cost related to non-vested equity awards is expected to be recognized (in years) |  |  | 2 years 6 months 15 days |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | 67 | 196 | $ 330 | 450 |  |
Stock options |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | 1,535 | 2,209 | 2,988 | 3,968 |  |
Restricted stock awards |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | $ 1,036 | 5,283 | $ 7,431 | 11,060 |  |
Granted (in shares) |  |  | 1,798 |  |  |
Non-vested at the beginning of the period (in shares) | 2,250 |  | 2,250 |  |  | 1,645
Restricted stock awards | 2015 Performance Obligation |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  |  |  |  | 2,251 |
Forecasted number of awards with contingent performance conditions | 561 |  | 561 |  |  |
Forecasted awards with contingent performance conditions (in dollars per share) | $ 23.49 |  | $ 23.49 |  |  |
Cost of revenues |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | $ 471 | 1,362 | $ 2,208 | 2,916 |  |
Research and development |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | 953 | 2,032 | 2,980 | 3,811 |  |
Selling, general and administrative |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |
Stock-based compensation expense | $ 1,214 | $ 4,294 | $ 5,561 | $ 8,751 |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Exercisable Number + References No definition available. + Details
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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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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