Financial Derivatives (Futures) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Fair Value	$ 159,503	$ 78,320
Financial derivatives–assets, at fair value-	198,023	132,518
Derivative Liability	$ 38,520	54,198
Futures
Derivative [Line Items]
Remaining Years to Maturity	2 months 23 days
Financial derivatives–assets, at fair value-	$ 6,165	2,772
Derivative Liability	163	96
Short | Futures
Derivative [Line Items]
Notional Amount	274,700	315,200
Fair Value	6,002	$ 2,676
Remaining Years to Maturity		2 months 23 days
Financial Derivatives - Liabilities | Short | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	$ 0	$ 49,800
Remaining Years to Maturity	2 months 23 days	3 months
Derivative Liability	$ 0	$ (31)
Financial Derivatives - Liabilities | Long | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	1,900	$ 1,900
Remaining Years to Maturity		2 months 19 days
Derivative Liability	(163)	$ (65)
Financial Derivatives - Assets | Short | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	$ 276,600	$ 267,300
Remaining Years to Maturity	2 months 23 days	2 months 19 days
Financial derivatives–assets, at fair value-	$ 6,165	$ 2,772
Financial Derivatives - Assets | Long | U.S. Treasury futures
Derivative [Line Items]
Remaining Years to Maturity	2 months 23 days