Equity-Based Compensation Plans - Vesting Terms (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in Period, Fair Value	$ 5.0	$ 3.6	$ 3.5
Restricted Stock And Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	730	496	730
Restricted Stock And Share Unit [Member] \| 25% per year for four years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	8
Restricted Stock And Share Unit [Member] \| 100% immediately
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	132	106	123
Restricted Stock And Share Unit [Member] \| 33.3% per year for three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	452	85	599
Restricted Stock And Share Unit [Member] \| 100% on February 14, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	305	0
Restricted Stock And Share Unit [Member] \| 100% on July 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	146	0	0

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).

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

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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(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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