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Real Estate Investments - Summary of Properties Sold (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 15, 2020 USD ($) a | Mar. 19, 2020 USD ($) ft² | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from the sale of properties |  |  |  |  | $ 21,250 | $ 5,523
Gain (loss) on sale |  |  | $ 0 | $ 0 | $ 2,586 | $ 0
Office properties | 52 East Swedesford Road |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Rentable area (in square feet) | ft² |  | 131,077 |  |  |  |
Proceeds from the sale of properties |  | $ 18,000 |  |  |  |
Gain (loss) on sale |  | $ 2,336 |  |  |  |
Office properties | Keith Valley |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from the sale of properties | $ 4,000 |  |  |  |  |
Gain (loss) on sale | $ 201 |  |  |  |  |
Land | Keith Valley |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Area of land (in acres) | a | 14.0 |  |  |  |  |

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