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Real Estate Transactions - MSREI MOB JV (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Aug. 31, 2018 USD ($) property | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Real Estate [Line Items] |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 21,000 |
Net real estate |  | $ 10,627,183 |  |  | $ 10,209,450
MSREI JV |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Ownership percentage (as a percent) | 51.00% | 51.00% |  |  |
Proceeds from contribution to a joint venture | $ 298,000 |  |  |  |
Number of properties contributed to joint venture | property | 9 |  |  |  |
Value of contributed properties | $ 320,000 |  |  |  |
Number of properties acquired (in properties) | property | 16 |  |  |  |
Noncontrolling interest in VIE |  |  | $ 298,000 |  |
Greenville Portfolio | MSREI JV |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Payments to acquire real estate | $ 285,000 |  |  |  |
Lease term | 10 years |  |  |  |
Net real estate |  |  | 276,000 |  |
Intangible assets acquired |  |  | $ 20,000 |  |

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