Loans and Preferred Equity Held for Investment, net - Nonaccrual and Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loan carrying value	$ 3,494,895	$ 3,574,989
Commercial mortgage
Financing Receivable, Past Due [Line Items]
Loan carrying value	3,494,895	3,574,989
Commercial mortgage | Current or Less Than 30 Days Past Due
Financing Receivable, Past Due [Line Items]
Loan carrying value	3,369,528	3,494,437
Commercial mortgage | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loan carrying value	0	68,432
Commercial mortgage | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loan carrying value	56,935	0
Commercial mortgage | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loan carrying value	$ 68,432	$ 12,120