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Share-based Compensation (Restricted Stock Awards And Restricted Stock Units Activity Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock Awards [Member] |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Grant date fair value of awards | $ 0.2 |  |
Unrecognized share-based compensation expense related to unvested awards | $ 0.1 |  |
Amortized over a weighted average period | 5 months 5 days |  |
RSUs vested in period (shares) | 29,000 |  |
Restricted Stock Units [Member] |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Grant date fair value of awards | $ 8.3 | $ 8.0 | $ 8.2
RSUs vested in period (shares) | 764,000 |  |
Time-based Restricted Stock Units [Member] |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Shares authorized for grant | 1,100,000 | 1,000,000 | 1,200,000
Unrecognized share-based compensation expense related to unvested awards | $ 9.9 |  |
Amortized over a weighted average period | 1 year 6 months 22 days |  |
RSUs vested in period (shares) | 696,083 | 599,071 | 437,132
Performance-based Restricted Stock Units [Member] |  |  |
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items] |  |  |
Shares authorized for grant | 1,300,000 | 1,200,000 | 1,500,000
Unrecognized share-based compensation expense related to unvested awards | $ 3.8 |  |
Amortized over a weighted average period | 1 year 11 months 9 days |  |
RSUs vested in period (shares) | 68,317 | 31,396 | 67,893

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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 Unrecognized cost of unvested options awarded to employees as compensation. + 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 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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(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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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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