Share-based Compensation (Restricted Stock Awards And Restricted Stock Units Activity Narrative) (Details) shares in Thousands, $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($) shares
Restricted Stock Awards
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unrecognized share-based compensation expense \| $	$ 0.2
Amortized over a weighted average period	10 months 24 days
Awards vested in period (shares) \| shares	8
Service-condition based RSUs
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unrecognized share-based compensation expense \| $	$ 10.9
Amortized over a weighted average period	1 year 8 months 12 days
Awards vested in period (shares) \| shares	600
Performance- and market-condition based RSUs
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unrecognized share-based compensation expense \| $	$ 8.7
Amortized over a weighted average period	2 years 1 month 6 days
Awards vested in period (shares) \| shares	400

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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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