Secured Debt, Net - Schedule of All in Cost of Secured Credit Facilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Face value	$ 14,931,693
Secured debt, net | Line of Credit
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	531,500
Collateral	709,000
Secured debt, net | Line of Credit | Secured credit facilities
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	531,530	$ 112,078
Face value	$ 11,012,558	$ 12,697,058
Wtd. avg. all-in cost (percentage)	1.91%	1.89%
Collateral	$ 16,451,583	$ 18,594,318
Wtd. avg. all-in yield (percentage)	3.62%	3.58%
Net interest margin (percentage)	1.71%	1.69%
Secured debt, net | Line of Credit | Secured credit facilities | + 1.50% or less
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 23,000	$ 0
Face value	$ 4,437,843	$ 5,647,848
Wtd. avg. all-in cost (percentage)	1.53%	1.53%
Collateral	$ 6,695,441	$ 8,341,383
Wtd. avg. all-in yield (percentage)	3.20%	3.24%
Net interest margin (percentage)	1.67%	1.71%
Secured debt, net | Line of Credit | Secured credit facilities | + 1.51% to + 1.75%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 74,118	$ 0
Face value	$ 2,861,825	$ 2,679,699
Wtd. avg. all-in cost (percentage)	1.79%	1.82%
Collateral	$ 3,969,387	$ 3,723,365
Wtd. avg. all-in yield (percentage)	3.54%	3.49%
Net interest margin (percentage)	1.75%	1.67%
Secured debt, net | Line of Credit | Secured credit facilities | + 1.76% to + 2.00%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 0	$ 42,908
Face value	$ 1,328,211	$ 1,850,809
Wtd. avg. all-in cost (percentage)	2.10%	2.11%
Collateral	$ 2,255,736	$ 2,913,067
Wtd. avg. all-in yield (percentage)	3.75%	3.92%
Net interest margin (percentage)	1.65%	1.81%
Secured debt, net | Line of Credit | Secured credit facilities | + 2.01% or more
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 434,412	$ 69,170
Face value	$ 2,384,679	$ 2,518,702
Wtd. avg. all-in cost (percentage)	2.65%	2.64%
Collateral	$ 3,531,019	$ 3,616,503
Wtd. avg. all-in yield (percentage)	4.49%	4.30%
Net interest margin (percentage)	1.84%	1.66%