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Commitments and Contingencies (Textual) (Details) - USD ($) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 02, 2015 | Sep. 30, 2019 | Dec. 31, 2018 | Oct. 13, 2017
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Loan outstanding principal balance |  | $ 2,078,255,000 | $ 2,028,046,000 |
General allowance for remaining portfolio of operating leases considered collectible |  | 11,300,000 |  |
4040 Wilson Venture |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Guarantees, maximum exposure amount |  | 41,300,000 |  |
Loan outstanding principal balance |  | 150,000,000.0 |  |
Unconsolidated Real Estate Ventures |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Real estate ventures aggregate indebtedness |  | 592,400,000 |  |
PJP VII |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Guarantees, maximum exposure amount |  | 300,000 |  |
Loan outstanding principal balance |  | 3,700,000 |  |
618 Market Street |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Contingent consideration, liability | $ 2,000,000.0 | 2,000,000.0 |  |
Fair value of contingent consideration | 1,600,000 |  |  |
Interest expense | $ 2,000,000.0 |  |  |
The Bulletin Building |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Funding requirement met for capital improvements |  | 5,100,000 |  |
Expected excess redevelopment funding |  | 39,000,000.0 |  |
Estimated aggregate cost |  | 84,800,000 |  |
Acquisition cost, inclusive in estimated aggregate cost |  |  |  | $ 37,800,000
Drexel Square |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Required spending in capital improvements to property |  | 8,500,000 |  |
Estimated potential additional contribution obligation |  | $ 2,900,000 |  |
Minimum |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Lease terms |  | 9 years |  |
Minimum | The Bulletin Building |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Required spending in capital improvements to property |  | $ 8,000,000.0 |  |
Maximum |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Lease terms |  | 65 years |  |
Mortgage Lenders |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Associated letter of credit |  | $ 0 |  |

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