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Equity Awards and Instruments - Stock Grants Narrative (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Class B Common Stock | 2020 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully vested shares granted (in shares)	17,411	0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

+ References

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