Derivative Instruments - Schedule of Notional Value and Fair Value of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Notional Value	$ 897,237	$ 669,469
Derivative Assets	14,014	20,941
Derivative Liabilities	17,612	14,944
Exchange-traded futures
Derivative [Line Items]
Notional Value	193,619	157,787
Derivative Assets	75	2,835
Derivative Liabilities	1,568	33
Currency forwards
Derivative [Line Items]
Notional Value	83,410	27,368
Derivative Assets	5,060	4,881
Derivative Liabilities	5,082	4,656
Interest rate swaps
Derivative [Line Items]
Notional Value	7,540	17,667
Derivative Assets	83	367
Derivative Liabilities	72	14
Credit default swaps
Derivative [Line Items]
Notional Value	375,539	199,720
Derivative Assets	744	4,172
Derivative Liabilities	9,870	9,099
Total return swaps
Derivative [Line Items]
Notional Value	187,081	216,468
Derivative Assets	2,864	663
Derivative Liabilities	585	1,087
Option swaps
Derivative [Line Items]
Notional Value	50,048	50,459
Derivative Assets	5,188	8,023
Derivative Liabilities	$ 435	$ 55