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LAND AND INVESTMENT IN THE LAND JV - Daytona Beach, Florida Land (Details)
 6 Months Ended 12 Months Ended
Oct. 16, 2019
USD ($)
Mar. 31, 2020
USD ($)
a
item
Dec. 31, 2019
USD ($)
a
Dec. 31, 2018
USD ($)
a
contract
mi
$ / a
Dec. 31, 2017
USD ($)
a
Land and development costs and subsurface interests          
Land sale acres | a     5,400    
Gain on Sale     $ 133,000,000   $ 31,800,000
Gain on sale of properties (in dollars per share)     20.60   $ 3.51
Land Sales          
Land and development costs and subsurface interests          
Land sale acres | a       2,697 1,700
Magnetar Investors | Land Sales          
Land and development costs and subsurface interests          
Area of land (in acres) | a       205  
Total proceeds from sale of controlling interest in wholly-owned entity       $ 43,700,000  
Gain on Sale       $ 32,600,000  
Number of contracts | contract       12  
Price per Acre | $ / a       4.44  
Land JV          
Land and development costs and subsurface interests          
Total proceeds from sale of controlling interest in wholly-owned entity $ 97,000,000 $ 97,000,000      
Proceeds from sale of land   $ 22,000,000      
Number of purchase and sale agreements | item   10      
Area of land remaining under contract | a   4,200      
Percentage of remaining land under contract   84.00%      
Gain on Sale 48,900,000        
Gain on sale of properties (in dollars per share) 7.59        
Property Management Fee Revenue Per Month     20,000    
Land JV | Land Sales          
Land and development costs and subsurface interests          
Gain on Sale 78,600,000   $ 127,500,000    
Gain on sale of properties (in dollars per share) $ 12.21        
Land sales, ownership interest sold (as a percent) 66.50%        
Land JV | Magnetar Investors          
Land and development costs and subsurface interests          
Noncontrolling interest (as a percent) 66.50%        
Ownership interest of controlling interest holders (as a percent) 33.50%   33.50%    
Undeveloped Land in Daytona Beach, Florida, Along Interstate 95          
Land and development costs and subsurface interests          
Area of land (in acres) | a     5,300 5,400  
Distance of land owned along Interstate | mi       6  
Property east of I-95          
Land and development costs and subsurface interests          
Distance of land owned along Interstate | mi       6