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Investments in Real Estate (Schedule of Real Estate Property Acquisitions) (Details) $ in Thousands |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 14, 2018 USD ($) | Feb. 09, 2018 USD ($) | Jan. 25, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) property | Apr. 19, 2018 USD ($) | Dec. 31, 2017 USD ($) property
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of properties | property |  |  |  |  | 203 |  | 205
Assets |  |  |  |  | $ 21,581,917 |  | $ 21,404,345
Liabilities |  |  |  |  | 10,595,502 |  | $ 10,300,993
Gross proceeds |  |  |  |  | 139,300 |  |
Gain (loss) on sale of property |  |  |  |  | $ 39,400 |  |
Held-for-sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of additional properties | property |  |  |  |  | 4 |  | 8
Number of properties | property |  |  |  |  | 4 |  |
Assets |  |  |  |  | $ 41,700 |  | $ 139,500
Liabilities |  |  |  |  | $ 1,800 |  | $ 5,000
200 Quannapowitt Parkway |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gross proceeds |  |  | $ 15,000 |  |  |  |
Gain (loss) on sale of property |  |  | $ (400) |  |  |  |
34551 Ardenwood Boulevard |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gross proceeds |  | $ 73,300 |  |  |  |  |
Gain (loss) on sale of property |  | $ 25,300 |  |  |  |  |
3065 Gold Camp Drive |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gross proceeds | $ 14,200 |  |  |  |  |  |
Gain (loss) on sale of property | 5,400 |  |  |  |  |  |
11085 Sun Center Drive |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gross proceeds | 36,800 |  |  |  |  |  |
Gain (loss) on sale of property | $ 9,100 |  |  |  |  |  |
Scenario, Forecast | Property in Austin, Texas | Disposal Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ 12,000 |  |  |
Subsequent Event | Property in Austin, Texas | Disposal Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Transaction value on sale of property |  |  |  |  |  | $ 48,000 |

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