Secured Financings of Investments in Real Estate Debt - Secured Financings on Investments in Real Estate Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowings Outstanding	$ 4,368,269	$ 4,966,685
Total assets	130,797,795	142,687,424
Notional Amount	36,177,869	40,556,507
Interest rate swaps - secured financings of investments in real estate debt | Non-designated Hedges
Debt Instrument [Line Items]
Notional Amount	581,915	1,392,960
Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 6,911,139	$ 8,138,317
LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.40%	1.30%
CMBS
Debt Instrument [Line Items]
Borrowings Outstanding	$ 4,018,216	$ 4,482,728
CMBS | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 6,385,599	$ 7,447,672
CMBS | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.40%	1.30%
Commercial real estate loans
Debt Instrument [Line Items]
Borrowings Outstanding	$ 146,172	$ 220,694
Commercial real estate loans | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 226,672	$ 294,337
Commercial real estate loans | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.80%	1.10%
RMBS
Debt Instrument [Line Items]
Borrowings Outstanding	$ 140,061	$ 99,716
RMBS | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 214,124	$ 137,084
RMBS | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.30%	1.10%
Corporate bonds
Debt Instrument [Line Items]
Borrowings Outstanding	$ 63,820	$ 163,547
Corporate bonds | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 84,744	$ 259,224
Corporate bonds | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.10%	1.90%