Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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
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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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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
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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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Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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Equity (Restricted Stock Awards And Restricted Stock Units Activity, Share-based Compensation) (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Shares approved for grants	1,500	900	900
Share-based compensation expense	$ 11.2	$ 12.7	$ 12.5
Capitalized share-based compensation expense	$ 0.0	$ 0.2	$ 0.7
Maximum [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Stock Option Vesting Period	4 years
Minimum [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Stock Option Vesting Period	3 years
Time-based Restricted Stock Units [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Shares approved for grants	400	300	400
Unrecognized share-based compensation expense related to unvested awards	$ 12.8
Amortized over a weighted average period	1 year 11 months 12 days
Restricted Stock And Restricted Units [Member] \| Maximum [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Stock Option Vesting Period	4 years
Restricted Stock And Restricted Units [Member] \| Minimum [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Stock Option Vesting Period	3 years
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	$ 0.1
Grant date fair value of vested awards	$ 0.2	$ 1.0	$ 1.3
Amortized over a weighted average period	5 months 9 days
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	$ 18.5
Grant date fair value of vested awards	$ 8.2	$ 9.6	$ 7.1
Amortized over a weighted average period	1 year 10 months 2 days
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	$ 5.7
Amortized over a weighted average period	1 year 8 months 23 days