Secured Debt, Net - Schedule of All in Cost of Secured Credit Facilities (Details) - Secured credit facilities - Line of Credit - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 3,057,639	$ 7,763,563
Total Borrowings	$ 13,213,212	$ 12,299,580
Wtd. Avg. All-in Cost (percentage)	1.81%	1.72%
Collateral	$ 18,962,300	$ 17,042,381
Wtd. Avg. All-in Yield (percentage)	3.61%	3.49%
Net Interest Margin (percentage)	1.80%	1.77%
+ 1.50% or less
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 1,194,022	$ 5,306,925
Total Borrowings	$ 7,635,918	$ 7,746,026
Wtd. Avg. All-in Cost (percentage)	1.52%	1.52%
Collateral	$ 10,764,384	$ 10,193,801
Wtd. Avg. All-in Yield (percentage)	3.20%	3.18%
Net Interest Margin (percentage)	1.68%	1.66%
+ 1.51% to + 1.75%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 359,518	$ 1,477,177
Total Borrowings	$ 2,403,030	$ 2,710,587
Wtd. Avg. All-in Cost (percentage)	1.88%	1.88%
Collateral	$ 3,734,985	$ 3,977,492
Wtd. Avg. All-in Yield (percentage)	3.59%	3.55%
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	$ 467,917	$ 668,470
Total Borrowings	$ 1,319,127	$ 998,781
Wtd. Avg. All-in Cost (percentage)	2.17%	2.13%
Collateral	$ 1,904,840	$ 1,458,074
Wtd. Avg. All-in Yield (percentage)	4.18%	4.28%
Net Interest Margin (percentage)	2.01%	2.15%
+ 2.01% or more
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 1,036,182	$ 310,991
Total Borrowings	$ 1,855,137	$ 844,186
Wtd. Avg. All-in Cost (percentage)	2.66%	2.49%
Collateral	$ 2,558,091	$ 1,413,014
Wtd. Avg. All-in Yield (percentage)	4.92%	4.75%
Net Interest Margin (percentage)	2.26%	2.26%