Financial Derivatives (Credit Default Swaps) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 131,472	$ 132,518
Financial derivatives–liabilities, at fair value-	(30,502)	(54,198)
Fair Value	(100,970)	(78,320)
Credit default swaps on asset-backed indices
Derivative [Line Items]
Financial derivatives–assets, at fair value-	4,536	3,366
Financial derivatives–liabilities, at fair value-	(33)	(33)
Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short
Derivative [Line Items]
Notional Amount	(50,599)	(58,004)
Financial derivatives–assets, at fair value-	4,524	3,362
Credit default swaps on asset-backed securities
Derivative [Line Items]
Financial derivatives–assets, at fair value-	76	76
Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short
Derivative [Line Items]
Notional Amount	(220)	(220)
Financial derivatives–assets, at fair value-	76	76
Credit default swaps
Derivative [Line Items]
Notional Amount	(580,666)	(238,773)
Fair Value	5,085	(1,720)
Credit default swaps on corporate bond indices
Derivative [Line Items]
Financial derivatives–assets, at fair value-	19	83
Financial derivatives–liabilities, at fair value-	(9,400)	(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		11 months 19 days