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Real Estate Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) ft² propertyUnit	Mar. 31, 2020 USD ($)
Acquisitions [Abstract]
Rentable square feet of commercial real estate properties (in sq feet) | ft²	27,400,000
Dispositions [Abstract]
Gains on disposition of property	$ 18,937	$ 153,067
Forum Buildings Acquisition
Acquisitions [Abstract]
Percentage of partner's interest in asset acquired (in hundredths)	75.00%
Number of buildings sold | propertyUnit	5
Rentable square feet of commercial real estate properties (in sq feet) | ft²	636,000
Acquisition purchase price	$ 131,300
Percentage of equity interest in joint venture (in hundredths)	25.00%
2021 Dispositions
Dispositions [Abstract]
Purchase price of real estate	$ 30,700
Gains on disposition of property	$ 18,900

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Percentage of partner's interest in asset acquired.

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The number of buildings sold.

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The maximum percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The purchase price of real estate before and/or after closing credits to buyer for unfunded tenant improvements, building improvements and/or free rent, if any.

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The amount of square footage related to real estate properties.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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