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Stock-based Compensation - Summary of Restricted Stock and Performance Share Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Performance share units
Number of shares
Balance	283,223
Granted	213,180
Vested	(60,990)
Performance adjustment	(12,609)
Balance	422,804
Weighted-average grant date fair value per share
Balance	$ 24.26
Granted	35.12	$ 28.49
Vested	22.45
Performance adjustment	21.80
Balance	$ 30.07
Restricted stock units
Number of shares
Balance	1,242,387
Granted	1,163,664
Vested	(352,548)
Forfeited	(14,968)
Balance	2,038,535
Weighted-average grant date fair value per share
Balance	$ 19.42
Granted	24.43
Vested	19.42
Forfeited	21.35
Balance	$ 22.27

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards pertaining to performance adjustment.

+ References

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Number of share representing performance adjustments relating to equity-based payment instruments, excluding stock (or unit) options.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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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).

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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).

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

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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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