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Real Estate Investments - Equity Investment In Joint Venture (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
ft²
property
Jun. 30, 2022
Jun. 28, 2022
Dec. 31, 2021
USD ($)
Mar. 31, 2017
Real Estate          
DHC Carrying value | $ $ 155,477     $ 215,127  
Number of properties owned (property) | property 379        
Joint Venture          
Real Estate          
DHC Carrying value | $ $ 155,477        
Number of properties owned (property) | property 11        
Area of real estate properties (in square feet) | ft² 2,203,242        
Seaport Innovation LLC | Joint Venture          
Real Estate          
Equity method investment ownership percentage 10.00% 20.00% 20.00% 20.00% 55.00%
DHC Carrying value | $ $ 104,697        
Number of properties owned (property) | property 1        
Area of real estate properties (in square feet) | ft² 1,134,479        
The LSMD Fund REIT LLC | Joint Venture          
Real Estate          
Equity method investment ownership percentage 20.00%        
DHC Carrying value | $ $ 50,780        
Number of properties owned (property) | property 10        
Area of real estate properties (in square feet) | ft² 1,068,763