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Changes in Stock (Details) - shares	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Common Stock Class A [Member]
Class of Stock [Line Items]
Common stock, shares issued (in shares)	53,742,067	52,766,000	53,170,413	52,654,000
Stock Issued During Period, Shares, New Issues	16,000	0
Deferred Compensation Arrangement with Individual, Shares Issued	81,000	112,000
Stock Repurchased During Period, Shares	0	0
Treasury Stock, Shares, Acquired	392,000	0
Common Stock Class A [Member] | Stock Investment Plan
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	475,000	0
Common Stock Class B [Member]
Class of Stock [Line Items]
Common stock, shares issued (in shares)	1,001,714	1,002,000	1,001,714	1,002,000
Stock Issued During Period, Shares, New Issues	0	0
Deferred Compensation Arrangement with Individual, Shares Issued	0	0
Stock Repurchased During Period, Shares	0	0
Treasury Stock, Shares, Acquired	0	1,002,000
Common Stock Class B [Member] | Stock Investment Plan
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	0	0
Treasury stock [Member]
Class of Stock [Line Items]
Common stock, shares issued (in shares)	4,530,000	4,138,000	4,138,000	3,136,000
Stock Issued During Period, Shares, New Issues	0	0
Deferred Compensation Arrangement with Individual, Shares Issued	0	0
Treasury stock [Member] | Stock Investment Plan
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	0	0

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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