Stockholders' Equity and Restrictions - Changes in Stock (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Common Stock Class A [Member]
Class of Stock [Line Items]
Common Stock, Balance at beginning of year	53,883	53,758
Stock issued for compensation	17	34
Common Stock, Balance at end of period	53,900	53,792
Common Stock Class B [Member]
Class of Stock [Line Items]
Common Stock, Balance at beginning of year	1,002	1,002
Stock issued for compensation	0	0
Common Stock, Balance at end of period	1,002	1,002
Treasury Stock
Class of Stock [Line Items]
Common Stock, Balance at beginning of year	5,330	4,937
Stock issued for compensation	0	0
Common Stock, Balance at end of period	5,330	4,937