Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 81,183	$ 18,894
Financial derivatives–liabilities, at fair value-	(20,442)	(12,298)
Total	60,741	6,596
TBA Securities, Purchase Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	220	522
Financial derivatives–liabilities, at fair value-	(91)	(135)
TBA Securities, Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	2,949	707
Financial derivatives–liabilities, at fair value-	(2,687)	(774)
Interest rate swaps | Short
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	72,740	11,871
Financial derivatives–liabilities, at fair value-	(1,911)	(6,567)
Interest rate swaps | Long
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	14	2,122
Financial derivatives–liabilities, at fair value-	(15,285)	(2,531)
Credit default swaps on asset-backed securities
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	202	303
Credit default swaps on asset-backed indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	2,089	1,751
Financial derivatives–liabilities, at fair value-	(34)	(39)
Credit default swaps on corporate bonds
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	201	0
Financial derivatives–liabilities, at fair value-	(338)	(99)
Credit default swaps on corporate bond indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	1,405	156
Financial derivatives–liabilities, at fair value-	0	(1,870)
Futures
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	316	478
Financial derivatives–liabilities, at fair value-	(96)	(75)
Futures | Short
Derivatives, Fair Value [Line Items]
Total	220	403
Forwards
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	244	0
Financial derivatives–liabilities, at fair value-	0	(208)
Warrants
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	803	706
Put Option [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 0	$ 278