XML 44 R31.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Employee Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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 June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Restricted stock units granted | 120 |  |  | 94 |  |  | 183 |  |  | 195 |
Weighted-average grant-date fair value | $ | 71.20 |  |  | $ | 35.60 |  |  | $ | 67.17 |  |  | $ | 31.23 |
Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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 June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Performance based restricted stock units granted (1) | 168 |  |  | 329 |  |  | 612 |  |  | 616 |
Weighted-average grant-date fair value | $ | 71.47 |  |  | $ | 36.35 |  |  | $ | 49.04 |  |  | $ | 36.01 |
(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.

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |