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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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- Definition 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 + Details
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