Financial Derivatives (Futures) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Fair Value	$ 79,788	$ 78,320
Financial derivatives–assets, at fair value-	104,033	132,518
Derivative Liability	$ 24,245	54,198
Futures
Derivative [Line Items]
Remaining Years to Maturity	2 months 23 days
Financial derivatives–assets, at fair value-	$ 88	2,772
Derivative Liability	3,076	96
Short | Futures
Derivative [Line Items]
Notional Amount	189,400	315,200
Fair Value	(2,988)	$ 2,676
Remaining Years to Maturity		2 months 23 days
Financial Derivatives - Liabilities | Short | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	$ 191,300	$ 49,800
Remaining Years to Maturity	2 months 23 days	3 months
Derivative Liability	$ (3,076)	$ (31)
Financial Derivatives - Liabilities | Long | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	0	$ 1,900
Remaining Years to Maturity		2 months 19 days
Derivative Liability	0	$ (65)
Financial Derivatives - Assets | Short | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	0	$ 267,300
Remaining Years to Maturity		2 months 19 days
Financial derivatives–assets, at fair value-	0	$ 2,772
Financial Derivatives - Assets | Long | U.S. Treasury futures
Derivative [Line Items]
Notional Amount	$ (1,900)	0
Remaining Years to Maturity	2 months 23 days
Financial derivatives–assets, at fair value-	$ 88	$ 0