Secured Financings of Investments in Real Estate Debt - Secured Financings on Investments in Real Estate Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowings Outstanding	$ 4,741,658	$ 4,966,685
Total assets	138,046,624	142,687,424
Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 7,663,984	$ 8,138,317
LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.40%	1.30%
CMBS
Debt Instrument [Line Items]
Borrowings Outstanding	$ 4,318,573	$ 4,482,728
CMBS | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 7,051,119	$ 7,447,672
CMBS | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.40%	1.30%
RMBS
Debt Instrument [Line Items]
Borrowings Outstanding	$ 201,843	$ 99,716
RMBS | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 281,531	$ 137,084
RMBS | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.20%	1.10%
Commercial real estate loans
Debt Instrument [Line Items]
Borrowings Outstanding	$ 153,038	$ 220,694
Commercial real estate loans | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 235,786	$ 294,337
Commercial real estate loans | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.90%	1.10%
Corporate bonds
Debt Instrument [Line Items]
Borrowings Outstanding	$ 68,204	$ 163,547
Corporate bonds | Asset Pledged as Collateral
Debt Instrument [Line Items]
Total assets	$ 95,548	$ 259,224
Corporate bonds | LIBOR
Debt Instrument [Line Items]
Weighted average interest rate	1.20%	1.90%