Financial Derivatives (Schedule of Credit Derivatives) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 160,043	$ 18,894
Derivative Liability	(50,418)	(12,298)
Derivative Assets (Liabilities), at Fair Value, Net	109,625	6,596
Credit default swaps on asset-backed indices
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	2,250	1,751
Derivative Liability	(32)	(39)
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long
Credit Derivatives [Line Items]
Notional value	259	484
Financial derivatives–assets, at fair value-	$ 3	$ 7
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	15 years 3 months	24 years 3 months 25 days
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value	$ 56,345	$ 13,947
Financial derivatives–assets, at fair value-	$ 2,247	$ 1,744
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	36 years 2 months 4 days	42 years 5 months 4 days
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long
Credit Derivatives [Line Items]
Notional value	$ 65	$ 89
Derivative Liability	$ (32)	$ (39)
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	26 years 8 months 23 days	27 years 4 months 28 days
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value	$ 0	$ 491
Derivative Liability	$ 0	$ 0
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	30 years 1 month 2 days	24 years 5 months 1 day
Credit default swaps on corporate bond indices
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 930	$ 156
Derivative Liability	(17)	(1,870)
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long
Credit Derivatives [Line Items]
Notional value	1,867	2,168
Financial derivatives–assets, at fair value-	$ 10	$ 156
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	1 year 2 months 19 days	1 year 11 months 19 days
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value	$ 134,382	$ 0
Financial derivatives–assets, at fair value-	$ 920	$ 0
Remaining Years to Maturity	5 years 3 days	0 days
Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value	$ 37,500	$ 21,183
Remaining Years to Maturity	4 years 8 months 19 days
Derivative Liability	$ (17)	$ (1,870)
Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		4 years 9 months
Credit default swaps on asset-backed securities
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	77	$ 303
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value	220	910
Financial derivatives–assets, at fair value-	$ 77	$ 303
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	12 years 10 months 9 days	13 years 8 months 15 days
Credit default swaps on corporate bonds
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 95	$ 0
Derivative Liability	(251)	(99)
Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value	6,000	0
Financial derivatives–assets, at fair value-	$ 95	$ 0
Remaining Years to Maturity	4 years 8 months 19 days	0 days
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value	$ 16,400	$ 3,400
Derivative Liability	$ (251)	$ (99)
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	4 years 3 months 21 days	3 years 5 months 19 days
Credit default swaps
Credit Derivatives [Line Items]
Notional value	$ 248,656	$ 37,190
Derivative Assets (Liabilities), at Fair Value, Net	$ 3,052	$ 202
Credit default swaps | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	11 years 11 months 26 days	19 years 1 month 6 days
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value	$ (19)	$ 124
Notional value	$ 2,191	$ 2,741