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Share-Based Compensation (RSUs Vested and Converted) (Details) - RSUs - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
RSUs vested during the year | 1,337 | 1,063 | 954
RSUs converted during the year, net of shares withheld for taxes | 865 | 705 | 1,238
Shares withheld for taxes | 472 | 358 | 549

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- Definition The number of shares (or other type of equity) coverted during the period, net of shares withheld for taxes. + References No definition available. + Details
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- Definition The number of shares (or other type of equity) withheld during the period for taxes on shares converted. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- 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
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