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Fair Value Measurements - Debt Securities, Available-for-sale Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of mortgage and other indebtedness $ 1,821,991 $ 1,833,992
Available-for-sale securities, amortized cost 258,507 293,476
Available-For-Sale Securities Held, Fair Value [1] 258,254 292,422
U.S Treasury Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, amortized cost 258,507 293,476
Available-For-Sale Securities Held, unrealized losses (253) (1,054)
Available-For-Sale Securities Held, Fair Value $ 258,254 $ 292,422
[1] As of September 30, 2023, includes $186,582 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $212,100 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 8.