Statutory Balances and Accounting Practices - Schedule Of Statutory Net Income And Capital And Surplus (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Statutory Balances And Accounting Practices [Abstract]
Statutory net (loss) income	[1]	$ (35,590)	$ (184,292)	$ 200,488
Statutory capital and surplus		$ 1,667,187	$ 1,502,424	$ 1,827,210
RBC authorized control level		3.50	3.30	4
RBC threshold for regulatory or company action		200.00%

[1] Statutory net (loss) income reflects differences from GAAP net income (loss), including changes in the fair value of the investment portfolio as a result of the application of the fair value option.