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Real Estate Investments - Equity Investment In Joint Venture (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
ft²
property
Dec. 31, 2022
USD ($)
Jun. 28, 2022
Dec. 31, 2021
Real Estate        
DHC Carrying Value of Investment | $ $ 153,744 $ 155,477    
Number of Properties | property 376      
Corporate Joint Venture        
Real Estate        
DHC Carrying Value of Investment | $ $ 153,744      
Number of Properties | property 11      
Square Feet | ft² 2,203,242      
Seaport Innovation LLC | Corporate Joint Venture        
Real Estate        
DHC Ownership 10.00%   20.00% 55.00%
DHC Carrying Value of Investment | $ $ 107,773      
Number of Properties | property 1      
Square Feet | ft² 1,134,479      
The LSMD Fund REIT LLC | Corporate Joint Venture        
Real Estate        
DHC Ownership 20.00%      
DHC Carrying Value of Investment | $ $ 45,971      
Number of Properties | property 10      
Square Feet | ft² 1,068,763