Investment in Securities (Summary of Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Securities, Available-for-sale [Line Items]
Interest Income	$ 115,471	$ 100,470	$ 231,384	$ 201,990
Agency RMBS
Securities, Available-for-sale [Line Items]
Coupon Interest	3,467	6,731	7,360	15,797
Net Amortization	(626)	128	(380)	(1,870)
Interest Income	2,841	6,859	6,980	13,927
Non-Agency RMBS and CMBS
Securities, Available-for-sale [Line Items]
Coupon Interest	19,279	6,118	34,677	14,805
Net Amortization	(11,673)	(557)	(18,408)	(1,407)
Interest Income	7,606	5,561	16,269	13,398
CLOs
Securities, Available-for-sale [Line Items]
Coupon Interest	2,166	3,728	5,328	5,614
Net Amortization	(805)	(1,104)	(2,130)	(1,480)
Interest Income	1,361	2,624	3,198	4,134
Other Securities
Securities, Available-for-sale [Line Items]
Coupon Interest	6,285	7,780	13,728	14,904
Net Amortization	(1,969)	(3,077)	(3,674)	(5,735)
Interest Income	4,316	4,703	10,054	9,169
Securities Investment [Member]
Securities, Available-for-sale [Line Items]
Coupon Interest	31,197	24,357	61,093	51,120
Net Amortization	(15,073)	(4,610)	(24,592)	(10,492)
Interest Income	$ 16,124	$ 19,747	$ 36,501	$ 40,628