Secured Debt, Net - Schedule of All in Cost of Secured Credit Facilities (Details) - Secured credit facilities - Line of Credit - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 407,616	$ 112,078
Total Borrowings	$ 12,403,449	$ 12,697,058
Wtd. Avg. All-in Cost (percentage)	1.89%	1.89%
Collateral	$ 18,132,466	$ 18,594,318
Wtd. Avg. All-in Yield (percentage)	3.58%	3.58%
Net Interest Margin (percentage)	1.69%	1.69%
+ 1.50% or less
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 23,000	$ 0
Total Borrowings	$ 5,632,133	$ 5,647,848
Wtd. Avg. All-in Cost (percentage)	1.52%	1.53%
Collateral	$ 8,305,372	$ 8,341,383
Wtd. Avg. All-in Yield (percentage)	3.24%	3.24%
Net Interest Margin (percentage)	1.72%	1.71%
+ 1.51% to + 1.75%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 0	$ 0
Total Borrowings	$ 2,496,771	$ 2,679,699
Wtd. Avg. All-in Cost (percentage)	1.81%	1.82%
Collateral	$ 3,471,486	$ 3,723,365
Wtd. Avg. All-in Yield (percentage)	3.52%	3.49%
Net Interest Margin (percentage)	1.71%	1.67%
+ 1.76% to + 2.00%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 0	$ 42,908
Total Borrowings	$ 1,649,419	$ 1,850,809
Wtd. Avg. All-in Cost (percentage)	2.10%	2.11%
Collateral	$ 2,582,739	$ 2,913,067
Wtd. Avg. All-in Yield (percentage)	3.86%	3.92%
Net Interest Margin (percentage)	1.76%	1.81%
+ 2.01% or more
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 384,616	$ 69,170
Total Borrowings	$ 2,625,126	$ 2,518,702
Wtd. Avg. All-in Cost (percentage)	2.62%	2.64%
Collateral	$ 3,772,869	$ 3,616,503
Wtd. Avg. All-in Yield (percentage)	4.25%	4.30%
Net Interest Margin (percentage)	1.63%	1.66%