Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 37,689	$ 20,263	$ 5,951
Addition to (release of) allowance for expected losses	9,393	17,426	14,312
Write-downs charged against allowance	(9,367)
Total ending balance	37,715	37,689	20,263
Commercial mortgage loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	36,758	19,665	5,847
Addition to (release of) allowance for expected losses	5,613	17,093	13,818
Write-downs charged against allowance	(9,367)
Total ending balance	33,004	36,758	19,665
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	931	598	104
Addition to (release of) allowance for expected losses	3,780	333	494
Write-downs charged against allowance	0
Total ending balance	$ 4,711	$ 931	$ 598