Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Interest rate swaps
Derivative [Line Items]
Average Monthly Notional	$ 4,309,089	$ 3,292,243
TBA securities
Derivative [Line Items]
Average Monthly Notional	603,206	796,003
Credit default swaps
Derivative [Line Items]
Average Monthly Notional	497,857	130,819
Total return swaps
Derivative [Line Items]
Average Monthly Notional	875	688
Futures
Derivative [Line Items]
Average Monthly Notional	246,669	186,446
Options
Derivative [Line Items]
Average Monthly Notional	0	13,846
Forwards
Derivative [Line Items]
Average Monthly Notional	15,567	13,676
Warrants
Derivative [Line Items]
Average Monthly Notional	$ 1,926	$ 3,378