Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 131,472	$ 132,518
Financial derivatives–liabilities, at fair value-	(30,502)	(54,198)
Total	100,970	78,320
TBA Securities, Purchase Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	11	0
Financial derivatives–liabilities, at fair value-	(536)	(2,007)
TBA Securities, Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	2,882	7,985
Interest rate swaps | Short
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	117,352	116,768
Financial derivatives–liabilities, at fair value-	(539)	(1,408)
Interest rate swaps | Long
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	1,558	254
Financial derivatives–liabilities, at fair value-	(19,708)	(48,882)
Credit default swaps on asset-backed securities
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	76	76
Credit default swaps on asset-backed indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	4,536	3,366
Financial derivatives–liabilities, at fair value-	(33)	(33)
Credit default swaps on corporate bonds
Derivatives, Fair Value [Line Items]
Financial derivatives–liabilities, at fair value-	(283)	(259)
Credit default swaps on corporate bond indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	19	83
Financial derivatives–liabilities, at fair value-	(9,400)	(1,513)
Futures
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	3,792	2,772
Financial derivatives–liabilities, at fair value-	(3)	(96)
Futures | Short
Derivatives, Fair Value [Line Items]
Total	3,789	2,676
Forwards
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	41	77
Warrants
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 1,205	$ 1,137