Secured Debt, Net - Schedule of All in Cost of Secured Credit Facilities (Details) - Secured credit facilities - Line of Credit - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New borrowings	$ 7,763,563	$ 898,516
Borrowings	$ 12,299,580	$ 7,896,863
Debt Instrument Weighted Average All In Cost	1.72%	1.83%
Collateral	$ 17,042,381	$ 12,040,907
Debt Instrument Weighted Average All In Yield	3.49%	3.40%
Net Interest Margin	1.77%	1.57%
+ 1.50% or less
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New borrowings	$ 5,306,925	$ 376,085
Borrowings	$ 7,746,026	$ 4,192,280
Debt Instrument Weighted Average All In Cost	1.52%	1.59%
Collateral	$ 10,193,801	$ 6,338,626
Debt Instrument Weighted Average All In Yield	3.18%	3.09%
Net Interest Margin	1.66%	1.50%
+ 1.50% or less | United State Dollar LIBOR Rate
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Basis spread on debt obligation	1.50%	1.50%
+ 1.51% to + 1.75%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New borrowings	$ 1,477,177	$ 172,447
Borrowings	$ 2,710,587	$ 1,945,692
Debt Instrument Weighted Average All In Cost	1.88%	1.95%
Collateral	$ 3,977,492	$ 2,975,581
Debt Instrument Weighted Average All In Yield	3.55%	3.43%
Net Interest Margin	1.67%	1.48%
+ 1.51% to + 1.75% | GBP LIBOR | Minimum
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Basis spread on debt obligation	1.51%	1.51%
+ 1.51% to + 1.75% | GBP LIBOR | Maximum
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Basis spread on debt obligation	1.75%	1.75%
+ 1.76% to + 2.00%
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New borrowings	$ 668,470	$ 215,056
Borrowings	$ 998,781	$ 926,666
Debt Instrument Weighted Average All In Cost	2.13%	2.06%
Collateral	$ 1,458,074	$ 1,212,546
Debt Instrument Weighted Average All In Yield	4.28%	3.83%
Net Interest Margin	2.15%	1.77%
+ 1.76% to + 2.00% | Sterling Overnight Interbank Average Rate | Minimum
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Basis spread on debt obligation	1.76%	1.76%
+ 1.76% to + 2.00% | Sterling Overnight Interbank Average Rate | Maximum
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Basis spread on debt obligation	2.00%	2.00%
+ 2.01% or more
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
New borrowings	$ 310,991	$ 134,928
Borrowings	$ 844,186	$ 832,225
Debt Instrument Weighted Average All In Cost	2.49%	2.49%
Collateral	$ 1,413,014	$ 1,514,154
Debt Instrument Weighted Average All In Yield	4.75%	4.34%
Net Interest Margin	2.26%	1.85%
+ 2.01% or more | EURIBOR
Schedule Of All In Cost Of Secured Credit Facilities [Line Items]
Basis spread on debt obligation	2.01%	2.01%