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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Restricted stock, restricted stock units, performance-based restricted stock units, cash-settled restricted stock units and cash-settled performance units
Shares
Non-vested awards at beginning of period (in shares)	2,446
Granted (in shares)	1,279
Vested (in shares)	(594)
Canceled (in shares)	(26)
Non-vested awards at end of period (in shares)	3,105
Weighted Average Grant Date Fair Value Per Share
Non-vested awards at beginning of period (in dollars per share) | $ / shares	$ 9.69
Granted (in dollars per share) | $ / shares	11.22
Vested (in dollars per share) | $ / shares	9.30
Canceled (in dollars per share) | $ / shares	9.80
Non-vested awards at end of period (in dollars per share) | $ / shares	$ 10.39
Cash-settled restricted stock units and cash-settled performance units
Shares
Non-vested awards at end of period (in shares)	611
Restricted stock and stock-settled performance units
Shares
Non-vested awards at end of period (in shares)	2,494

X

- Definition

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

+ 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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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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-Publisher FASB
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-Paragraph 2
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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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-Publisher FASB
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-Section 50
-Paragraph 2
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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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-Paragraph 2
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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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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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