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Stock-Based Compensation Plans and Employee Benefits - Directors' Awards (Details) - Directors $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
CSE and Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested, outstanding (in shares)	255,921
Non-vested, aggregate intrinsic value | $	$ 3.2
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	80,270
Grant date fair value (in dollars per share) | $ / shares	$ 8.74
CSE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	3,481
Grant date fair value (in dollars per share) | $ / shares	$ 9.45

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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