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Real Estate Investments - Summary of Office Property Sold (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) ft² property | Sep. 30, 2017 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from the sale of properties |  |  | $ 16,771 | $ 114,821
Gain (Loss) on Sale | $ 0 | $ 0 | $ (35) | $ 8,411
Office Properties [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties Sold | property |  |  | 1 |
Rentable Square Feet | ft² | 38,260 |  | 38,260 |
Sales Price | $ 2,000 |  | $ 2,000 |
Proceeds from the sale of properties |  |  | 1,850 |
Gain (Loss) on Sale |  |  | $ (35) |
20 East Clementon Road [Member] | Office Properties [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties Sold | property |  |  | 1 |
Rentable Square Feet | ft² | 38,260 |  | 38,260 |
Sales Price | $ 2,000 |  | $ 2,000 |
Proceeds from the sale of properties |  |  | 1,850 |
Gain (Loss) on Sale |  |  | $ (35) |

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