Share-based Compensation (Restricted Stock Awards And Restricted Stock Units Activity Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Awards
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
RSAs and RSUs general vesting period	3 years
Shares granted in period (shares)	13
Weighted average grant date fair value of granted (in dollars per share)	$ 18.61	$ 6.84	$ 10.28
Grant date fair value of awards	$ 0.2	$ 0.2	$ 0.2
Unrecognized share-based compensation expense related to unvested awards	$ 0.1
Amortized over a weighted average period	5 months 5 days
Awards vested in period (shares)	24
Restricted Stock Units
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
RSAs and RSUs general vesting period	3 years
Shares granted in period (shares)	1,404
Weighted average grant date fair value of granted (in dollars per share)	$ 14.34	$ 6.84	$ 9.16
Grant date fair value of awards	$ 9.7	$ 8.3	$ 8.0
Awards vested in period (shares)	1,123
Time-based RSUs
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Shares granted in period (shares)	400	1,100	1,000
Unrecognized share-based compensation expense related to unvested awards	$ 7.7
Amortized over a weighted average period	1 year 3 months 15 days
Awards vested in period (shares)	900	700	600
Performance-based RSUs
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Shares granted in period (shares)	1,000	1,300	1,200
Unrecognized share-based compensation expense related to unvested awards	$ 6.4
Amortized over a weighted average period	2 years 4 months 7 days
Awards vested in period (shares)	200	100	100
Minimum \| Performance-based RSUs
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Percentage of performance range of RSUs that may be awarded (percent)	0.00%
Maximum \| Performance-based RSUs
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Percentage of performance range of RSUs that may be awarded (percent)	200.00%

Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Performance Metric

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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.

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