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Consolidated Statements of Financial Position (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Investments:    
Fixed maturities available-for-sale, cost $ 1,381,318 $ 1,343,755
Private equity funds 66,846 56,038
Accounts Receivable, Allowance for Credit Loss $ 347 $ 111
Common Stock Class A [Member]    
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) 53,758,176 53,170,413
Common stock, shares outstanding (in shares) 53,758,176 53,170,413
Common stock, shares in treasury (in shares) 3,935,581 3,135,738
Common Stock Class B [Member]    
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
Common stock, shares in treasury (in shares) 1,001,714 1,001,714