Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fixed income securities, amortized cost	$ 289,712	$ 341,685
Available-for-sale Securities	157,020	135,224
Restricted Cash	17,669	11,881	$ 13,612
Derivative assets	0	656
Other assets	92,317	65,817
Assets	8,058,378	8,428,320	7,972,730
Accrued interest payable	2,560	0
Derivative liabilities	317	0
Other liabilities	89,036	60,419
Liabilities	6,862,857	6,996,627
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	5,351	6,594
Corporate Debt Securities [Member]
Fixed income securities, amortized cost	92,990	92,694
Available-for-sale Securities	89,192	87,991
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	3,905	4,965
Municipal Bonds [Member]
Fixed income securities, amortized cost	14,646	9,394
Available-for-sale Securities	14,083	8,711
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	570	696
Variable Interest Entity [Member]
Restricted Cash	$ 47,275	$ 19,223	$ 19,941