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Real Estate Transactions - MSREI MOB JV (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) property | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) property
Real Estate [Line Items] |  |  |  |
Number of properties acquired | property |  |  |  | 20
Payments to acquire real estate |  |  | $ 21,000 |
Net real estate |  | $ 10,235,700 | $ 10,235,700 | $ 10,731,878
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 | property | 16 |  |  |
Noncontrolling interest in VIE |  | 298,000 | $ 298,000 |
Greenville Portfolio | MSREI JV |  |  |  |
Real Estate [Line Items] |  |  |  |
Payments to acquire real estate | $ 285,000 |  |  |
Lease term | 10 years |  |  |
Percentage of rentable area leased | 93.00% |  |  |
Net real estate |  | 273,000 | $ 273,000 |
Intangible assets acquired |  | $ 20,000 |  |

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