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Share-Based Compensation (Details) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Class B Common Stock Bonus
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded in period (in shares)	391,107	375,796
Vesting period	3 years	3 years
Class B Common Stock Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded in period (in shares)		414,500
Vesting period		10 years
U.K. Subsidiary Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded in period (in shares)		86,000
Vesting period		5 years

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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).

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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.

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