Unrecognized cost of unvested share-based compensation awards.

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 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).

+ 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)(1)
-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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- Definition

Percentage of vesting of share-based compensation awards.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Share-Based Compensation - Performance- and Market-Based Awards (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Performance and Market Based Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost (in dollars)	$ 19.8
Market Based Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost (in dollars)	$ 2.7
Performance Period Ending December 2019 \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	103,297
Performance Period Ending December 2019 \| Market Based Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	44,275
Performance Period Ending December 2017 \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	146,094	14,940
Performance Period Ending December 2017 \| Market Based Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		6,403
Performance Period Ending December 2018 \| Market Based Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		52,404
Performance Period Ending December 2016, Measure One \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		15,605
Performance Period Ending December 2016, Measure Two \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		144,995
Performance Period Ending December 2018, Measure One \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		29,332
Performance Period Ending December 2018, Measure Two \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		67,517
Performance Period Ending December 2018, Measure Three \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		78,220
Performance Period Ending December 2018, Measure Four \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		122,284