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Real Estate Investments - Equity Investment In Joint Venture (Details) $ in Thousands	Dec. 31, 2021 USD ($) ft² property	Dec. 23, 2021	Dec. 31, 2020 USD ($)	Mar. 31, 2017
Real Estate
DHC Carrying value | $	$ 215,127		$ 0
Number of properties owned (property) | property	390
Seaport Innovation LLC | Joint Venture
Real Estate
Equity method investment ownership percentage	20.00%	20.00%		55.00%
DHC Carrying value | $	$ 215,127
Number of properties owned (property) | property	1
Area of real estate properties (in square feet) | ft²	1,134,479

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Area of a real estate property.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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The number of real estate properties owned as of the balance sheet date.

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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