Financial Derivatives (Schedule of Credit Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Oct. 03, 2022
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-		$ 132,518	$ 18,894	$ 7,121
Derivative Liability		(54,198)	(12,298)
Derivative Assets (Liabilities), at Fair Value, Net		78,320	6,596
Credit default swaps on asset-backed indices
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-		3,366	1,751
Derivative Liability		(33)	(39)
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long
Credit Derivatives [Line Items]
Notional value		253	484
Financial derivatives–assets, at fair value-		$ 4	$ 7
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		14 years 11 months 26 days	24 years 3 months 25 days
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value		$ 58,004	$ 13,947
Financial derivatives–assets, at fair value-		$ 3,362	$ 1,744
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		35 years 8 months 12 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		$ (33)	$ (39)
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		26 years 5 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			24 years 5 months 1 day
Credit default swaps on corporate bond indices
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-		83	$ 156
Derivative Liability		(1,513)	(1,870)
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long
Credit Derivatives [Line Items]
Notional value		2,037	2,168
Financial derivatives–assets, at fair value-		$ 40	$ 156
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		11 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		$ 1,498	$ 0
Financial derivatives–assets, at fair value-		$ 43	0
Remaining Years to Maturity	0 days	11 months 19 days
Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value		$ 165,006	21,183
Remaining Years to Maturity		4 years 11 months 8 days
Derivative Liability		$ (1,513)	$ (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-		76	$ 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-		$ 76	$ 303
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		12 years 7 months 9 days	13 years 8 months 15 days
Credit default swaps on corporate bonds
Credit Derivatives [Line Items]
Derivative Liability		$ (259)	$ (99)
Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Remaining Years to Maturity	0 days
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value		16,400	3,400
Derivative Liability		$ (259)	$ (99)
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		4 years 21 days	3 years 5 months 19 days
Credit default swaps
Credit Derivatives [Line Items]
Notional value		$ 238,773	$ 37,190
Derivative Assets (Liabilities), at Fair Value, Net		$ 1,720	$ 202
Credit default swaps | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity		12 years 4 months 6 days	19 years 1 month 6 days
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value		$ 11	$ 124
Notional value		$ 2,355	$ 2,741