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Employee Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Restricted stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock options and restricted stock units activity | The following table summarizes restricted stock units with only service conditions granted under our 2010 Equity Incentive Plan:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Restricted stock units granted | 105 |  |  | 106 |  |  | 288 |  |  | 301 |
Weighted-average grant-date fair value | $ | 79.71 |  |  | $ | 47.19 |  |  | $ | 71.74 |  |  | $ | 36.86 |
Performance based shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock options and restricted stock units activity | The following table summarizes the performance-based restricted stock units granted under our 2010 Equity Incentive Plan:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Performance based restricted stock units granted (1) | — |  |  | 1 |  |  | 612 |  |  | 616 |
Weighted-average grant-date fair value | $ | — |  |  | $ | 46.28 |  |  | $ | 49.04 |  |  | $ | 36.02 |
(1 | ) | Performance awards granted also reflects the impact of any incremental shares awarded during the periods ended for performance periods completed. The grant date fair value for these awards are based on the grant price at the time of the initial award.

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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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