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Stock-Based Compensation Plans and Employee Benefits (Restricted Stock Unit Activity) (Details) - Restricted Stock Units shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) shares
Number of Shares
Non-vested at beginning of period (in shares)	531
Granted (in shares)	327
Vested (in shares)	(107)
Non-vested at end of period (in shares)	751
Unrecognized compensation cost | $	$ 8.0
Weighted-average period to recognize the unrecognized compensation cost	1 year 10 months 24 days

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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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

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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.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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