Financial Derivatives (Credit Default Swaps) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 104,033	$ 132,518
Financial derivatives–liabilities, at fair value-	(24,245)	(54,198)
Fair Value	(79,788)	(78,320)
Credit default swaps on asset-backed indices
Derivative [Line Items]
Financial derivatives–assets, at fair value-	4,846	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	(51,995)	(58,004)
Financial derivatives–assets, at fair value-	4,843	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	(202,633)	(238,773)
Fair Value	(2,936)	(1,720)
Credit default swaps on corporate bond indices
Derivative [Line Items]
Financial derivatives–assets, at fair value-	44	83
Financial derivatives–liabilities, at fair value-	(1,720)	(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