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Share-based Compensation (Restricted Stock Awards And Restricted Stock Units Activity Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) shares
Restricted Stock Awards [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unrecognized share-based compensation expense related to unvested awards | $	$ 0.2
Amortized over a weighted average period	11 months 5 days
Restricted stock vested in period (shares) | shares	39,000
Time-based Restricted Stock Units [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unrecognized share-based compensation expense related to unvested awards | $	$ 10.7
Amortized over a weighted average period	1 year 8 months 26 days
Restricted stock vested in period (shares) | shares	800,000
Performance-based Restricted Stock Units [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unrecognized share-based compensation expense related to unvested awards | $	$ 9.2
Amortized over a weighted average period	2 years 8 months 5 days
Restricted stock vested in period (shares) | shares	200,000

X

- 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

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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

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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

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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.

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