Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022
Interest rate swaps
Derivative [Line Items]
Average Monthly Notional	$ 1,343,094	$ 3,292,243
TBA securities
Derivative [Line Items]
Average Monthly Notional	1,105,311	796,003
Credit default swaps
Derivative [Line Items]
Average Monthly Notional	110,084	130,819
Total return swaps
Derivative [Line Items]
Average Monthly Notional	2,593	688
Futures
Derivative [Line Items]
Average Monthly Notional	193,600	186,446
Options
Derivative [Line Items]
Average Monthly Notional	13,846	13,846
Forwards
Derivative [Line Items]
Average Monthly Notional	21,188	13,676
Warrants
Derivative [Line Items]
Average Monthly Notional	$ 1,948	$ 3,378