Real Estate and Other Investments - Equity Method Investments in Unconsolidated Joint Ventures (Details) $ in Thousands |
Sep. 30, 2024
USD ($)
ft²
property
|
Dec. 31, 2023
USD ($)
|
|---|---|---|
| Real Estate | ||
| DHC carrying value | $ | $ 110,513 | $ 129,916 |
| Number of properties owned (property) | property | 368 | |
| Corporate Joint Venture | ||
| Real Estate | ||
| DHC carrying value | $ | $ 110,513 | |
| Number of properties owned (property) | property | 11 | |
| Area of real estate properties (in square feet) | ft² | 2,203,242 | |
| Seaport Innovation LLC | Corporate Joint Venture | ||
| Real Estate | ||
| Equity method investment ownership percentage | 10.00% | |
| DHC carrying value | $ | $ 65,590 | |
| Number of properties owned (property) | property | 1 | |
| Area of real estate properties (in square feet) | ft² | 1,134,479 | |
| The LSMD Fund REIT LLC | Corporate Joint Venture | ||
| Real Estate | ||
| Equity method investment ownership percentage | 20.00% | |
| DHC carrying value | $ | $ 44,923 | |
| Number of properties owned (property) | property | 10 | |
| Area of real estate properties (in square feet) | ft² | 1,068,763 |