Consolidated Statements of Financial Position (Parenthetical) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturities available-for-sale, cost	$ 1,401,301,000	$ 1,389,038,000
Private equity funds	93,337,000	82,460,000
Restricted Cash and Investments, Current	1,554,000	0
Accounts Receivable, Allowance for Credit Loss	$ 516,000	$ 408,000
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)	54,235,165	53,882,661
Common stock, shares outstanding (in shares)	54,235,165	53,882,661
Treasury Stock, Common, Shares	4,327,810	4,327,810
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
Treasury Stock, Common, Shares	1,001,714	1,001,714