Financial Derivatives (Credit Default Swaps) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 143,996	$ 132,518
Financial derivatives–liabilities, at fair value-	(61,776)	(54,198)
Fair Value	(82,220)	(78,320)
Credit default swaps on asset-backed indices
Derivative [Line Items]
Financial derivatives–assets, at fair value-	3,318	3,366
Financial derivatives–liabilities, at fair value-	(32)	(33)
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short
Derivative [Line Items]
Notional Amount	(42,101)	(58,004)
Financial derivatives–assets, at fair value-	$ 3,306	$ 3,362
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short | Weighted Average
Derivative [Line Items]
Remaining Years to Maturity	35 years 1 month 9 days	35 years 8 months 12 days
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long
Derivative [Line Items]
Notional Amount	$ (230)	$ (253)
Financial derivatives–assets, at fair value-	$ 12	$ 4
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long | Weighted Average
Derivative [Line Items]
Remaining Years to Maturity	13 years 11 months 26 days	14 years 11 months 26 days
Credit default swaps on corporate bonds
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 25	$ 0
Financial derivatives–liabilities, at fair value-	(225)	(259)
Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long
Derivative [Line Items]
Notional Amount	(2,000)	0
Financial derivatives–assets, at fair value-	$ 25	$ 0
Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | Weighted Average
Derivative [Line Items]
Remaining Years to Maturity	1 year 11 months 19 days	0 days
Credit default swaps on asset-backed securities
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 8	$ 76
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short
Derivative [Line Items]
Notional Amount	(45)	(220)
Financial derivatives–assets, at fair value-	$ 8	$ 76
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | Weighted Average
Derivative [Line Items]
Remaining Years to Maturity	11 years 8 months 26 days	12 years 7 months 9 days
Credit default swaps on corporate bond indices
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 7,259	$ 83
Financial derivatives–liabilities, at fair value-	(15,894)	(1,513)
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Short
Derivative [Line Items]
Notional Amount	0	(1,498)
Financial derivatives–assets, at fair value-	$ 0	$ 43
Remaining Years to Maturity	0 days	11 months 19 days
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long
Derivative [Line Items]
Notional Amount	$ (149,000)	$ (2,037)
Financial derivatives–assets, at fair value-	$ 7,259	$ 40
Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long | Weighted Average
Derivative [Line Items]
Remaining Years to Maturity	4 years 5 months 19 days	11 months 19 days
Credit default swaps
Derivative [Line Items]
Notional Amount	$ (441,155)	$ (238,773)
Fair Value	$ 5,541	$ (1,720)
Credit default swaps | Weighted Average
Derivative [Line Items]
Remaining Years to Maturity	7 years 9 months 21 days	12 years 4 months 6 days