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Equity - Activity for Class B Common Stock and Treasury Stock (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	10,966,089	8,439,747	10,174,013	8,375,077
Stock Award Activity (in shares)	(11,750)	(56,750)	(724,674)	(706,331)
Purchase of Treasury Stock (in shares)	993,100	843,416	2,498,100	1,557,667
Ending Balance (in shares)	11,947,439	9,226,413	11,947,439	9,226,413
Class B Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	98,539,367	101,065,709	99,331,443	101,130,379
Stock Award Activity (in shares)	11,750	56,750	724,674	706,331
Purchase of Treasury Stock (in shares)	(993,100)	(843,416)	(2,498,100)	(1,557,667)
Ending Balance (in shares)	97,558,017	100,279,043	97,558,017	100,279,043
Purchase of Treasury Stock (in shares)			2,500,000

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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 increase (decrease) during the period in the number of shares issued.

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

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Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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Number of shares that have been repurchased during the period and are being held in treasury.

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