Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 160,043	$ 18,894
Financial derivatives–liabilities, at fair value-	(50,418)	(12,298)
Total	109,625	6,596
TBA Securities, Purchase Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	60	522
Financial derivatives–liabilities, at fair value-	(789)	(135)
TBA Securities, Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	29,056	707
Financial derivatives–liabilities, at fair value-	(9)	(774)
Interest rate swaps | Short
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	125,823	11,871
Financial derivatives–liabilities, at fair value-	0	(6,567)
Interest rate swaps | Long
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	0	2,122
Financial derivatives–liabilities, at fair value-	(49,041)	(2,531)
Credit default swaps on asset-backed securities
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	77	303
Credit default swaps on asset-backed indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	2,250	1,751
Financial derivatives–liabilities, at fair value-	(32)	(39)
Credit default swaps on corporate bonds
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	95	0
Financial derivatives–liabilities, at fair value-	(251)	(99)
Credit default swaps on corporate bond indices
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	930	156
Financial derivatives–liabilities, at fair value-	(17)	(1,870)
Total return swaps
Derivatives, Fair Value [Line Items]
Financial derivatives–liabilities, at fair value-	(37)	0
Futures
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	828	478
Financial derivatives–liabilities, at fair value-	(242)	(75)
Futures | Short
Derivatives, Fair Value [Line Items]
Total	586	403
Forwards
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	261	0
Financial derivatives–liabilities, at fair value-	0	(208)
Warrants
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	663	706
Put Option [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives–assets, at fair value-	$ 0	$ 278