v3.26.1
Marketable Securities, Derivative Financial Instruments, Fair Value Measurements and Notes Payable - Schedule of available for sale securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Equity securities:    
Equity securities, adjusted cost $ 22,556 $ 22,545
Equity securities, gross unrealized gains 19,427 19,128
Equity securities, gross unrealized losses (81) (93)
Equity securities, fair value 41,902 41,580
Equity securities, adjusted cost 23,563 23,552
Equity securities, gross unrealized gains 19,434 19,175
Equity securities, gross unrealized losses (81) (93)
Equity securities, fair value 42,916 42,634
Common and Preferred Equity Securities [Member]    
Equity securities:    
Equity securities, adjusted cost 4,220 4,209
Equity securities, gross unrealized gains 411 396
Equity securities, gross unrealized losses (81) (93)
Equity securities, fair value 4,550 4,512
Simon OP Units [Member]    
Equity securities:    
Equity securities, adjusted cost 18,336 18,336
Equity securities, gross unrealized gains 19,016 18,732
Equity securities, gross unrealized losses 0 0
Equity securities, fair value 37,352 37,068
Corporate Bonds [Member]    
Equity securities:    
Equity securities, adjusted cost 1,007 1,007
Equity securities, gross unrealized gains 7 47
Equity securities, gross unrealized losses 0  
Equity securities, fair value $ 1,014 $ 1,054