Stock-Based Compensation (Schedule of Shares and Units of Restricted Common Stock) (Details) - Restricted Stock Units (RSUs) shares in Thousands	12 Months Ended
Dec. 31, 2021 $ / shares shares
Number of Shares/Units
Outstanding at beginning of year — unvested (in shares) \| shares	3,540
Granted (in shares) \| shares	2,547
Cancelled (in shares) \| shares	(462)
Vested (in shares) \| shares	(1,645)
Outstanding at end of year — unvested (in shares) \| shares	3,980
Weighted Average Grant Date Fair Value
Outstanding at beginning of year — unvested (in usd per share) \| $ / shares	$ 8.81
Granted (in usd per share) \| $ / shares	29.30
Cancelled (in usd per share) \| $ / shares	18.17
Vested (in usd per share) \| $ / shares	11.68
Outstanding at end of year — unvested (in usd per share) \| $ / shares	$ 19.72

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

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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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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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- 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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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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