Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Interest rate swaps
Derivative [Line Items]
Average Monthly Notional	$ 2,994,551	$ 1,343,094
TBA securities
Derivative [Line Items]
Average Monthly Notional	788,951	1,105,311
Credit default swaps
Derivative [Line Items]
Average Monthly Notional	94,392	110,084
Total return swaps
Derivative [Line Items]
Average Monthly Notional	299	2,593
Futures
Derivative [Line Items]
Average Monthly Notional	148,880	193,600
Options
Derivative [Line Items]
Average Monthly Notional	18,000	13,846
Forwards
Derivative [Line Items]
Average Monthly Notional	14,289	21,188
Warrants
Derivative [Line Items]
Average Monthly Notional	$ 3,365	$ 1,948