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Real Estate Investments - Summary of Properties Sold (Details) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
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Jul. 21, 2020 USD ($) ft² | Jun. 15, 2020 USD ($) a | Mar. 19, 2020 USD ($) ft² | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from the sale of properties |  |  |  |  |  | $ 122,055 | $ 41,546
Gain (loss) on sale |  |  |  | $ 271,901 | $ 356 | $ 274,487 | $ 356
One and Two Commerce Square |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Sale of ownership interest percentage | 30.00% |  |  |  |  |  |
Total sale price for property sold | $ 115,000 |  |  |  |  |  |
Value of properties sold | $ 600,000 |  |  |  |  |  |
Gain on sale |  |  |  | $ 271,900 |  |  |
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 | One and Two Commerce Square |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Rentable area (in square feet) | ft² | 1,896,142 |  |  |  |  |  |
Proceeds from the sale of properties | $ 115,000 |  |  |  |  |  |
Gain (loss) on sale | $ 271,905 |  |  |  |  |  |
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 |  |  |  |  |
Proceeds from the sale of properties |  | $ 4,000 |  |  |  |  |
Gain (loss) on sale |  | $ 201 |  |  |  |  |

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