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Employee Benefits and Share-Based Compensation - Summary of Performance-Based Restricted Stock Activity (Details) - Performance-Based Restricted Stock - 2009 Plan shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Shares
Outstanding at beginning of period (in shares) | shares	155
Granted (Awarded) (in shares) | shares	51
Vested (Released) (in shares) | shares	(17)
Forfeited (in shares) | shares	(6)
Outstanding and unvested at end of period (in shares) | shares	183
Weighted-Average Grant Date Fair Value
Outstanding and unvested (in dollars per share) | $ / shares	$ 74.26
Granted (Awarded) (in dollars per share) | $ / shares	156.79
Vested (Released) (in dollars per share) | $ / shares	82.35
Forfeited (in dollars per share) | $ / shares	63.20
Outstanding and unvested (in dollars per share) | $ / shares	$ 96.94

X

- Definition

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

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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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