Financial Derivatives (Futures) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value		$ 6,596	$ (9,074)
Financial derivatives–assets, at fair value-		18,894	15,479
Derivative Liability		$ 12,298	24,553
Futures
Derivative [Line Items]
Remaining Years to Maturity		2 months 26 days
Financial derivatives–assets, at fair value-		$ 478	2
Derivative Liability		75	376
Short | Futures
Derivative [Line Items]
Notional Amount		219,500	176,600
Fair Value		403	(374)
Remaining Years to Maturity	2 months 26 days
Financial Derivatives - Liabilities | Short | U.S. Treasury futures
Derivative [Line Items]
Notional Amount		$ 51,400	178,200
Remaining Years to Maturity	2 months 26 days	2 months 19 days
Derivative Liability		$ (39)	(367)
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	2 months 19 days
Derivative Liability		$ (36)	(9)
Financial Derivatives - Assets | Short | U.S. Treasury futures
Derivative [Line Items]
Notional Amount		$ 170,000	300
Remaining Years to Maturity	2 months 19 days	3 months
Financial derivatives–assets, at fair value-		$ 478	$ 2