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Fair Value Measurements - Debt Securities, Available-for-sale Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of mortgage and other indebtedness $ 2,095,476 $ 2,110,154
Available-for-sale securities, amortized cost 260,076 242,881
Available-For-Sale Securities Held, Fair Value [1] 260,434 243,148
U.S Treasury Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, amortized cost 260,076 242,881
Available-For-Sale Securities Held, unrealized gain 358 267
Available-For-Sale Securities Held, Fair Value $ 260,434 $ 243,148
U.S. Treasury securities, maturity date Jul. 31, 2026  
[1] As of September 30, 2025, includes $165,941 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $211,371 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 8.