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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 07, 2021
Commitments and Contingencies        
Contingent liabilities for construction performance $ 2.1 $ 2.4    
Harbor Point Parcel 3 Partnership        
Commitments and Contingencies        
Outstanding letters of credit       $ 15.0
Interlock Commercial | Financial Guarantee        
Commitments and Contingencies        
Guarantor obligations of the senior construction loan (up to) 37.5      
Guarantor obligations liability $ 1.2      
Hampton Roads Properties | Rental Revenues | Geographic Concentration Risk        
Commitments and Contingencies        
Concentrations of credit risk 40.00% 44.00% 48.00%  
Town Center Properties | Rental Revenues | Geographic Concentration Risk        
Commitments and Contingencies        
Concentrations of credit risk 26.00% 27.00% 31.00%  
Operating Partnership        
Commitments and Contingencies        
Outstanding letters of credit $ 9.5 $ 9.5 $ 9.5  
Group Of Three Construction Customers | General Contracting and Real Estate Services Revenues | Customer Concentration Risk        
Commitments and Contingencies        
Concentrations of credit risk 58.00% 65.00% 67.00%