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Real Estate Property Investments - Narrative (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 USD ($) ft² property | Sep. 30, 2017 USD ($) property | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Real Estate [Line Items] |  |  |  |
Impairments (recoveries), net |  |  | $ 22,590 | $ 0
Casualty-related loss, net insurance proceeds |  | $ 11,000 | $ 9,912 | $ 0
Property damage related to casualty loss |  | 6,000 |  |
Other associated costs related to casualty loss |  | 5,000 |  |
Deferred tax benefit associated with casualty related losses |  | $ 2,000 |  |
Senior housing triple-net |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of real estate properties impaired | property |  | 11 |  |
Impairments (recoveries), net |  | $ 23,000 |  |
Hayden Research Campus | Subsequent Event | Life science |  |  |  |
Real Estate [Line Items] |  |  |  |
Amount of consideration transferred to acquire property | $ 228,000 |  |  |
Hayden Research Campus | Building | Subsequent Event | Life science |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties | property | 2 |  |  |
Area of real estate property | ft² | 400 |  |  |
Percentage of rentable area leased | 66.00% |  |  |
Other income (expense), net |  |  |  |
Real Estate [Line Items] |  |  |  |
Casualty-related loss, net insurance proceeds |  | 10,000 |  |
Equity income (loss) from unconsolidated joint ventures |  |  |  |
Real Estate [Line Items] |  |  |  |
Casualty-related loss, net insurance proceeds |  | $ 1,000 |  |

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