Share-Based Compensation - Performance and Market- Based Awards Granted (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Performance Based Awards
Share-based Compensation
Performance period	3 years
Unrecognized compensation cost (in dollars)	$ 28.4
Number of shares granted	86,779
Performance Based Awards \| Minimum
Share-based Compensation
Performance period		1 year
Performance Based Awards \| Maximum
Share-based Compensation
Performance period		2 years
Vesting percentage		200.00%
Performance Based Awards \| Performance Period Ending December 2021
Share-based Compensation
Number of shares granted	79,132
Performance Based Awards \| Performance Period Ending December 2020
Share-based Compensation
Number of shares granted		79,218
Performance Based Awards \| Performance Period Ending December 2018
Share-based Compensation
Number of shares granted		95,748
Market Based Share Awards
Share-based Compensation
Unrecognized compensation cost (in dollars)	$ 4.7
Number of shares granted	30,856	33,940
Market Based Share Awards \| Maximum
Share-based Compensation
Vesting percentage	200.00%
Nonvested Share Awards
Share-based Compensation
Unrecognized compensation cost (in dollars)	$ 41.2
Number of shares granted	304,911	292,359

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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&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.

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