Derivative Instruments - Schedule of Gains and Losses for Derivative Instruments Recognized in Investment Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (12,776)	$ (4,950)
Exchange-traded futures
Derivative [Line Items]
Gains (losses) on derivative instruments	258	(1,579)
Currency forwards
Derivative [Line Items]
Gains (losses) on derivative instruments	(655)	364
Interest rate swaps
Derivative [Line Items]
Gains (losses) on derivative instruments	(352)	143
Credit default swaps
Derivative [Line Items]
Gains (losses) on derivative instruments	434	(829)
Total return swaps
Derivative [Line Items]
Gains (losses) on derivative instruments	(11,417)	(3,256)
Option swaps
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (1,044)	$ 207