Investments - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 575	$ 348	$ 597	$ 249
Provision and recoveries	79	22	243	223
Sales/collections and write-offs	(151)	0	(337)	(102)
Allowance for credit losses, end of period	503	370	503	370
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	11,253	3,709	11,081	3,775
Provision and recoveries	185	27	357	59
Sales/collections and write-offs	0	0	0	(98)
Allowance for credit losses, end of period	11,438	3,736	11,438	3,736
Agent loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	957	957	957	957
Provision and recoveries	0	0	0	0
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	$ 957	$ 957	$ 957	$ 957