Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 65,082	$ 18,894
Financial derivatives–liabilities, at fair value-	(16,528)	(12,298)
Total	48,554	6,596
TBA Securities, Purchase Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	0	522
Financial derivatives–liabilities, at fair value-	0	(135)
TBA Securities, Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	5,082	707
Financial derivatives–liabilities, at fair value-	(937)	(774)
Interest rate swaps | Short
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	50,234	11,871
Financial derivatives–liabilities, at fair value-	(1,583)	(6,567)
Interest rate swaps | Long
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	1,015	2,122
Financial derivatives–liabilities, at fair value-	(10,362)	(2,531)
Credit default swaps on asset-backed securities
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	304	303
Credit default swaps on asset-backed indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	1,193	1,751
Financial derivatives–liabilities, at fair value-	(38)	(39)
Credit default swaps on corporate bonds
Derivatives, Fair Value [Line Items]
Financial derivatives–liabilities, at fair value-	(84)	(99)
Credit default swaps on corporate bond indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	154	156
Financial derivatives–liabilities, at fair value-	(3,321)	(1,870)
Futures
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	5,794	478
Financial derivatives–liabilities, at fair value-	(131)	(75)
Futures | Short
Derivatives, Fair Value [Line Items]
Total	5,663	403
Forwards
Derivatives, Fair Value [Line Items]
Financial derivatives–liabilities, at fair value-	(72)	(208)
Warrants
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	1,058	706
Put Option [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 248	$ 278