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Consolidated Statements of Financial Position (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investments:    
Fixed maturities available-for-sale, cost $ 1,389,390 $ 1,381,318
Limited partnership 79,535 66,846
Due premiums, allowance for doubtful accounts $ 357 $ 347
Liabilities and Stockholders' Equity    
Treasury stock 5,262,000 4,937,000
Common Stock Class A [Member]    
Liabilities and Stockholders' Equity    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 53,880,359 53,758,176
Common stock, shares outstanding (in shares) 53,880,359 53,758,176
Treasury stock 4,261,005 3,935,581
Common Stock Class B [Member]    
Liabilities and Stockholders' Equity    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 2,000,000 2,000,000
Common stock, shares issued (in shares) 1,001,714 1,001,714
Common stock, shares outstanding (in shares) 1,001,714 1,001,714
Treasury stock 1,001,714 1,001,714