Secured Debt, Net - Schedule of All in Cost of Secured Credit Facilities (Details) - Secured credit facilities - Line of Credit - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 3,060,267	$ 7,763,563
Total Borrowings	$ 13,932,436	$ 12,299,580
Wtd. Avg. All-in Cost (percentage)	1.79%	1.72%
Collateral	$ 19,485,553	$ 17,042,381
Wtd. Avg. All-in Yield (percentage)	3.58%	3.49%
Net Interest Margin (percentage)	1.79%	1.77%
+ 1.50% or less
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 1,329,670	$ 5,306,925
Total Borrowings	$ 8,110,825	$ 7,746,026
Wtd. Avg. All-in Cost (percentage)	1.52%	1.52%
Collateral	$ 10,957,198	$ 10,193,801
Wtd. Avg. All-in Yield (percentage)	3.19%	3.18%
Net Interest Margin (percentage)	1.67%	1.66%
+ 1.51% to + 1.75%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 322,306	$ 1,477,177
Total Borrowings	$ 2,630,077	$ 2,710,587
Wtd. Avg. All-in Cost (percentage)	1.88%	1.88%
Collateral	$ 3,986,106	$ 3,977,492
Wtd. Avg. All-in Yield (percentage)	3.58%	3.55%
Net Interest Margin (percentage)	1.70%	1.67%
+ 1.76% to + 2.00%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 480,738	$ 668,470
Total Borrowings	$ 1,404,894	$ 998,781
Wtd. Avg. All-in Cost (percentage)	2.16%	2.13%
Collateral	$ 2,077,065	$ 1,458,074
Wtd. Avg. All-in Yield (percentage)	4.15%	4.28%
Net Interest Margin (percentage)	1.99%	2.15%
+ 2.01% or more
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New Financings	$ 927,553	$ 310,991
Total Borrowings	$ 1,786,640	$ 844,186
Wtd. Avg. All-in Cost (percentage)	2.57%	2.49%
Collateral	$ 2,465,184	$ 1,413,014
Wtd. Avg. All-in Yield (percentage)	4.84%	4.75%
Net Interest Margin (percentage)	2.27%	2.26%