Financial Derivatives (Schedule of Credit Derivatives) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 81,183	$ 18,894
Derivative Liability	(20,442)	(12,298)
Derivative Assets (Liabilities), at Fair Value, Net	60,741	6,596
Credit default swaps on asset-backed indices
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	2,089	1,751
Derivative Liability	(34)	(39)
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long
Credit Derivatives [Line Items]
Notional value	270	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	15 years 6 months	24 years 3 months 25 days
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value	$ 16,285	$ 13,947
Financial derivatives–assets, at fair value-	$ 2,085	$ 1,744
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	41 years 6 months 14 days	42 years 5 months 4 days
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long
Credit Derivatives [Line Items]
Notional value	$ 249	$ 89
Derivative Liability	$ (34)	$ (39)
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	34 years 8 months 12 days	27 years 4 months 28 days
Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value	$ 1	$ 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	27 years 6 months 3 days	24 years 5 months 1 day
Credit default swaps on corporate bond indices
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 1,405	$ 156
Derivative Liability	0	(1,870)
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long
Credit Derivatives [Line Items]
Notional value	1,996	2,168
Financial derivatives–assets, at fair value-	$ 13	$ 156
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	1 year 5 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	$ 50,561	$ 0
Financial derivatives–assets, at fair value-	$ 1,392	$ 0
Remaining Years to Maturity	4 years 8 months 12 days	0 days
Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short
Credit Derivatives [Line Items]
Notional value	$ 0	$ 21,183
Derivative Liability	$ 0	$ (1,870)
Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	0 days	4 years 9 months
Credit default swaps on asset-backed securities
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 202	$ 303
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short
Credit Derivatives [Line Items]
Notional value	916	910
Financial derivatives–assets, at fair value-	$ 202	$ 303
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	13 years 2 months 15 days	13 years 8 months 15 days
Credit default swaps on corporate bonds
Credit Derivatives [Line Items]
Financial derivatives–assets, at fair value-	$ 201	$ 0
Derivative Liability	(338)	(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-	$ 201	$ 0
Remaining Years to Maturity	4 years 11 months 23 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	$ (338)	$ (99)
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	4 years 6 months 21 days	3 years 5 months 19 days
Credit default swaps
Credit Derivatives [Line Items]
Notional value	$ 87,648	$ 37,190
Derivative Assets (Liabilities), at Fair Value, Net	$ 3,525	$ 202
Credit default swaps | Weighted Average
Credit Derivatives [Line Items]
Remaining Years to Maturity	11 years 6 months 29 days	19 years 1 month 6 days
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value	$ (17)	$ 124
Notional value	$ 2,515	$ 2,741