Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturities available-for-sale, cost	$ 1,397,074	$ 1,389,038
Limited partnership	84,853	82,460
Due premiums, allowance for doubtful accounts	$ 431	$ 408
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)	53,900,208	53,882,661
Common stock, shares outstanding (in shares)	53,900,208	53,882,661
Treasury stock	4,327,810	4,327,810
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