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Real Estate and Other Investments - Equity Method Investments in Unconsolidated Joint Ventures (Details) $ in Thousands | Sep. 30, 2025 USD ($) ft² property | Dec. 31, 2024 USD ($)
--- | --- | ---
Real Estate |  |
DHC carrying value | $ | $ 112,769 | $ 126,859
Number of properties owned (property) | property | 335 |
Corporate Joint Venture |  |
Real Estate |  |
DHC carrying value | $ | $ 112,769 |
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 | $ | $ 67,060 |
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 | $ | $ 45,709 |
Number of properties owned (property) | property | 10 |
Area of real estate properties (in square feet) | ft² | 1,068,763 |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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