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Real Estate Investments, Net - Dispositions (Details) $ in Thousands, € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 EUR (€) | Sep. 30, 2018 USD ($) property | Dec. 31, 2017 GBP (£) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) property | Dec. 31, 2017 property
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties held for sale (property) | property |  |  |  |  | 0 |  | 0
Proceeds from dispositions of real estate investments, net |  |  |  |  | $ 23,310 | $ 12,440 |
(Loss) gain on dispositions of real estate investments |  | $ (1,933) |  | $ 275 | (5,751) | 1,089 |
Reduction to gain on prior disposition |  |  |  | 100 |  | 100 |
Advisor |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
(Loss) gain on dispositions of real estate investments |  |  |  | $ 300 |  | $ 800 |
Kulicke & Soffa |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of properties sold (property) | property |  |  |  |  |  | 1 |
Mortgages |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Repayments of mortgage debt | € (0.1) | $ (3,000) | £ (0.8) |  | (1,700) |  |
Properties Sold |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Proceeds from dispositions of real estate investments, net |  |  |  |  | 25,300 |  |
(Loss) gain on dispositions of real estate investments |  |  |  |  | $ (5,800) |  |
Properties Sold | Kulicke & Soffa |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Proceeds from dispositions of real estate investments, net |  |  |  |  |  | $ 12,400 |
(Loss) gain on dispositions of real estate investments |  |  |  |  |  | 400 |
Proceeds from dispositions of real estate investments, gross |  |  |  |  |  | $ 13,000 |
Vandalia, Ohio | Properties Sold |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of properties sold (property) | property |  | 1 |  |  |  |  |
Proceeds from dispositions of real estate investments, net |  | $ 5,000 |  |  |  |  |
Lease termination fee |  | 3,000 |  |  |  |  |
(Loss) gain on dispositions of real estate investments |  | (1,900) |  |  |  |  |
San Jose, California | Properties Sold |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of properties sold (property) | property |  |  |  |  | 1 |  |
Proceeds from dispositions of real estate investments, net |  |  |  |  | $ 1,300 |  |
(Loss) gain on dispositions of real estate investments |  | (3,800) |  |  |  |  |
Proceeds from dispositions of real estate investments, gross |  | $ 20,300 |  |  |  |  |

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