v3.26.1
Marketable Securities, Derivative Financial Instruments, Fair Value Measurements and Notes Payable - Schedule of marketable securities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Marketable Securities:    
Available-for-sale Securities $ 50,726 $ 42,634
Common and Preferred Equity Securities [Member]    
Marketable Securities:    
Available-for-sale Securities 4,916 4,512
Simon OP Units [Member]    
Marketable Securities:    
Available-for-sale Securities 44,785 37,068
Corporate Bonds [Member]    
Marketable Securities:    
Available-for-sale Securities 1,025 1,054
Level 1 [Member]    
Marketable Securities:    
Available-for-sale Securities 2,168 1,794
Level 1 [Member] | Common and Preferred Equity Securities [Member]    
Marketable Securities:    
Available-for-sale Securities 2,168 1,794
Level 1 [Member] | Simon OP Units [Member]    
Marketable Securities:    
Available-for-sale Securities 0 0
Level 1 [Member] | Corporate Bonds [Member]    
Marketable Securities:    
Available-for-sale Securities 0 0
Level 2 [Member]    
Marketable Securities:    
Available-for-sale Securities 48,558 40,840
Level 2 [Member] | Common and Preferred Equity Securities [Member]    
Marketable Securities:    
Available-for-sale Securities 2,748 2,718
Level 2 [Member] | Simon OP Units [Member]    
Marketable Securities:    
Available-for-sale Securities 44,785 37,068
Level 2 [Member] | Corporate Bonds [Member]    
Marketable Securities:    
Available-for-sale Securities 1,025 1,054
Level 3 [Member]    
Marketable Securities:    
Available-for-sale Securities 0 0
Level 3 [Member] | Common and Preferred Equity Securities [Member]    
Marketable Securities:    
Available-for-sale Securities 0 0
Level 3 [Member] | Simon OP Units [Member]    
Marketable Securities:    
Available-for-sale Securities 0 0
Level 3 [Member] | Corporate Bonds [Member]    
Marketable Securities:    
Available-for-sale Securities $ 0 $ 0