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Investment in Real Estate - Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 30, 2019 | Jul. 24, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Real Estate [Line Items] |  |  |  |  |  |  |  |
Gains on sale of real estate |  |  | $ 47,100 |  | $ 3,735 |  | $ 47,100 | $ 43,337
Long-lived asset impairment charges |  |  |  | $ 52,200 |  | $ 0 |  | 0
Impairment loss |  |  | $ 0 |  | $ 0 |  | $ 52,201 | $ 0
Campus Center |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Sales price |  | $ 70,300 |  |  |  |  |  |
Sales price, land | $ 78,100 |  |  |  |  |  |  |

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + 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=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Definition 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. + References No definition available. + Details
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