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Changes in Stock (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Common stock, shares issued (in shares)	4,937,000	4,138,000	4,937,000	4,138,000
Common Stock Class A [Member]
Class of Stock [Line Items]
Common stock, shares issued (in shares)	3,935,581		3,935,581
Deferred Compensation Arrangement with Individual, Shares Issued	34,000	18,000
Shares, Issued	53,792,000	53,533,000	53,758,000	53,170,000
Common Stock Class A [Member] | Stock Investment Plan
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	0	345,000
Common Stock Class B [Member]
Class of Stock [Line Items]
Common stock, shares issued (in shares)	1,001,714		1,001,714
Deferred Compensation Arrangement with Individual, Shares Issued	0	0
Shares, Issued	1,002,000	1,002,000	1,002,000	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, Common [Member]
Class of Stock [Line Items]
Deferred Compensation Arrangement with Individual, Shares Issued	0	0
Treasury Stock, Common [Member] | Stock Investment Plan
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	0	0

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