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Segment Results - Narrative (Details)
ft² in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
ft²
a
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Revenue, Major Customer [Line Items]      
Number of operating segments 3    
Number of reportable segments 3    
Maui | Mahi Pono Holdings, LLC | Not Discontinued Operations      
Revenue, Major Customer [Line Items]      
Gross profit | $   $ 6.7 $ 162.2
Land | Real estate leasing and development      
Revenue, Major Customer [Line Items]      
Rentable area | ft² 3.9    
Land | Hawaii | Real estate leasing and development      
Revenue, Major Customer [Line Items]      
Area of real estate property | a 153.8