v3.26.1
Marketable Securities, Derivative Financial Instruments, Fair Value Measurements and Notes Payable - Schedule of available for sale securities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Equity securities:    
Equity securities, adjusted cost $ 22,567 $ 22,545
Equity securities, gross unrealized gains 27,219 19,128
Equity securities, gross unrealized losses (85) (93)
Equity securities, fair value 49,701 41,580
Equity securities, adjusted cost 23,574 23,552
Equity securities, gross unrealized gains 27,237 19,175
Equity securities, gross unrealized losses (85) (93)
Equity securities, fair value 50,726 42,634
Common and Preferred Equity Securities [Member]    
Equity securities:    
Equity securities, adjusted cost 4,231 4,209
Equity securities, gross unrealized gains 770 396
Equity securities, gross unrealized losses (85) (93)
Equity securities, fair value 4,916 4,512
Simon OP Units [Member]    
Equity securities:    
Equity securities, adjusted cost 18,336 18,336
Equity securities, gross unrealized gains 26,449 18,732
Equity securities, gross unrealized losses 0 0
Equity securities, fair value 44,785 37,068
Corporate Bonds [Member]    
Equity securities:    
Equity securities, adjusted cost 1,007 1,007
Equity securities, gross unrealized gains 18 47
Equity securities, gross unrealized losses 0 0
Equity securities, fair value $ 1,025 $ 1,054