Investments - Allowances for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other loans receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of year	$ 3,775	$ 3,564
Provision and recoveries	7,404	211
Sales/collections and write-offs	(98)	0
Allowance for credit losses, end of year	11,081	3,775
Agent loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of year	957	957
Provision and recoveries	0	0
Sales/collections and write-offs	0	0
Allowance for credit losses, end of year	$ 957	$ 957