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Subsequent Events (Details) - USD ($) $ in Thousands | Jul. 21, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Debt, net |  | $ 2,201,755 |
Secured Debt |  |  |
Subsequent Event [Line Items] |  |  |
Debt, net |  | $ 310,155 | $ 313,812
Subsequent Event | Philadelphia - Office |  |  |
Subsequent Event [Line Items] |  |  |
Sale of ownership interest percentage | 30.00% |  |
Sale price of property sold | $ 115,000 |  |
Net proceeds | 100,800 |  |
Fair vaue adjustment upon deconsolidation | 270,000 |  |
Subsequent Event | Philadelphia - Office | Secured Debt |  |  |
Subsequent Event [Line Items] |  |  |
Debt, net | 222,100 |  |
Preferred Equity Interest In One Commerce Square and Two Commerce Square | Subsequent Event | Philadelphia - Office |  |  |
Subsequent Event [Line Items] |  |  |
Equity commitment | 20,000 |  |
Preferred Equity Interest In One Commerce Square and Two Commerce Square | Investor In One Commerce Square And Two Commerce Square | Subsequent Event | Philadelphia - Office |  |  |
Subsequent Event [Line Items] |  |  |
Equity commitment | $ 20,000 |  |

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