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REAL ESTATE OPERATIONS - Land Impairments and Discontinued Operations (Details)
3 Months Ended 9 Months Ended 12 Months Ended 27 Months Ended
Dec. 10, 2021
USD ($)
a
Oct. 16, 2019
a
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
a
Transaction
Dec. 31, 2021
USD ($)
Land and development costs and subsurface interests                    
Number of land sale transactions | Transaction                 5  
No. of Acres | a                 5,400  
Gross Sales Price                 $ 108,000,000.0  
Gain on Sale                 133,000,000.0  
Gain on disposal per share                 20.60  
Impairment Charges             $ 17,599,000 $ 9,147,000    
Undeveloped land                    
Land and development costs and subsurface interests                    
Impairment Charges               7,200,000    
Daytona Beach Development                    
Land and development costs and subsurface interests                    
Impairment Charges         $ 100,000     $ 100,000    
Land JV                    
Land and development costs and subsurface interests                    
Number of land sale transactions | item               1    
No. of Acres | a 1,600                  
Area of land sales as a percentage of land holdings             33.50%      
Gross Sales Price           $ 80,700,000     48,900,000 $ 147,000,000.0
Proceeds from sale of land $ 24,500,000           $ 24,500,000      
Final sales price $ 66,300,000                  
Impairment Charges     $ 1,100,000 $ 16,500,000     17,600,000 $ 7,100,000    
Land JV | Daytona Beach Development                    
Land and development costs and subsurface interests                    
No. of Acres | a   5,300                
Impairment Charges               7,100,000    
Income Properties                    
Land and development costs and subsurface interests                    
Impairment Charges             0 0 0  
Undeveloped Land in Daytona Beach, Florida, Along Interstate 95                    
Land and development costs and subsurface interests                    
Impairment Charges             17,600,000 $ 7,200,000    
Undeveloped Land in Daytona Beach, Florida, Along Interstate 95 | Land JV                    
Land and development costs and subsurface interests                    
Impairment Charges     $ 1,100,000 $ 16,500,000     $ 17,600,000      
Magnetar Land Sale                    
Land and development costs and subsurface interests                    
Gross Sales Price                 $ 97,000,000.0  
Unicorp Development One                    
Land and development costs and subsurface interests                    
Number of land sale transactions | Transaction                 2  
No. of Acres | a                 23.6  
Gross Sales Price                 $ 7,100,000  
Unicorp Development Two                    
Land and development costs and subsurface interests                    
No. of Acres | a                 38  
Gross Sales Price                 $ 700,000  
Land sale to NADG                    
Land and development costs and subsurface interests                    
No. of Acres | a                 13  
Gross Sales Price                 $ 3,000,000.0