Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 143,996	$ 132,518
Financial derivatives–liabilities, at fair value-	(61,776)	(54,198)
Total	82,220	78,320
TBA Securities, Purchase Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	2,182	0
Financial derivatives–liabilities, at fair value-	0	(2,007)
TBA Securities, Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	0	7,985
Financial derivatives–liabilities, at fair value-	(5,820)	0
Interest rate swaps | Short
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	101,881	116,768
Financial derivatives–liabilities, at fair value-	(17,944)	(1,408)
Interest rate swaps | Long
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	27,358	254
Financial derivatives–liabilities, at fair value-	(13,801)	(48,882)
Credit default swaps on asset-backed securities
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	8	76
Credit default swaps on asset-backed indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	3,318	3,366
Financial derivatives–liabilities, at fair value-	(32)	(33)
Credit default swaps on corporate bonds
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	25	0
Financial derivatives–liabilities, at fair value-	(225)	(259)
Credit default swaps on corporate bond indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	7,259	83
Financial derivatives–liabilities, at fair value-	(15,894)	(1,513)
Total return swaps
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	6	0
Futures
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	245	2,772
Financial derivatives–liabilities, at fair value-	(7,990)	(96)
Futures | Short
Derivatives, Fair Value [Line Items]
Total	(7,745)	2,676
Forwards
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	12	77
Financial derivatives–liabilities, at fair value-	70	0
Warrants
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 1,702	$ 1,137