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Organization (Details) $ in Thousands	Dec. 31, 2021 USD ($) ft² property	Dec. 23, 2021	Dec. 31, 2020 USD ($)	Mar. 31, 2017
Real Estate Properties [Line Items]
Number of properties owned (property)	390
Number of states in which properties are located	36
Total real estate properties, gross | $	$ 6,813,556		$ 7,410,730
Seaport Innovation LLC | Joint Venture
Real Estate Properties [Line Items]
Number of properties owned (property)	1
Equity method investment ownership percentage	20.00%	20.00%		55.00%
Area of real estate properties (in square feet) | ft²	1,134,479
Occupancy rate	100.00%
Lessee, operating lease, remaining lease term	7 years

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Occupancy Rate

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Area of a real estate property.

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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
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Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

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

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The number of states the entity operates in as of the balance sheet date.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate 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
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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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