Investments - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 503	$ 370	$ 597	$ 249
Provision and recoveries	158	55	401	278
Sales/collections and write-offs	(231)	(72)	(568)	(174)
Allowance for credit losses, end of period	430	353	430	353
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	2,167	0	0	0
Provision and recoveries	0	0	2,167	0
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	2,167	0	2,167	0
Other loans receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	11,438	3,736	11,081	3,775
Provision and recoveries	474	2	831	61
Sales/collections and write-offs	0	0	0	(98)
Allowance for credit losses, end of period	11,912	3,738	11,912	3,738
Agent loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	957	957	957	957
Provision and recoveries	354	0	354	0
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	$ 1,311	$ 957	$ 1,311	$ 957