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Commitments and Contingencies (Textual) (Details) |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 02, 2015 USD ($) | Sep. 30, 2004 USD ($) | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) | Oct. 13, 2017 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  | $ 370,319,000 | $ 768,912,000 |
Loan outstanding principal balance |  |  | $ 2,028,046,000 | 1,930,828,000 |
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition |  |  | 15 years |  |
4040 Wilson Venture [Member] |  |  |  |  |
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 |  |
Prentiss Properties Trust [Member] | Commerce Square [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Non-controlling interest, ownership percentage by non-controlling Owners |  |  | 1.00% |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  | $ 370,319,000 |  |
PJP VII [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  | 3,777,000 | $ 4,792,000 |
Guarantees, maximum exposure amount |  |  | 300,000 |  |
Loan outstanding principal balance |  |  | 3,800,000 |  |
618 Market Street [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Contingent consideration, liability | $ 2,000,000.0 |  | 1,900,000 |  |
Fair value of contingent consideration | 1,600,000 |  |  |  |
Interest expense | $ 2,000,000.0 |  |  |  |
The Bulletin Building [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Funding requirement met for capital improvements |  |  | 1,200,000 |  |
Estimated of funding In the ground lease |  |  | 37,300,000 |  |
Estimated aggregate cost |  |  | 83,100,000 |  |
Acquisition cost, inclusive in estimated aggregate cost |  |  |  |  | $ 37,800,000
Drexel Square [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Required spending in capital improvements to property |  |  | 2,700,000 |  |
Estimated potential additional contribution obligation |  |  | $ 600,000 |  |
Two Logan Square [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Leased Area Of Building | ft² |  |  | 708,844 |  |
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage |  |  | $ 2,900,000 |  |
Liability related to acquisition of TRC |  | $ 700,000 | 2,700,000 |  |
One Commerce Square [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Tax guarantee obligation |  |  | 125,000,000.0 |  |
Two Commerce Square [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Tax guarantee obligation |  |  | $ 100,000,000.0 |  |
Minimum [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Lease terms |  |  | 10 years |  |
Minimum [Member] | The Bulletin Building [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Required spending in capital improvements to property |  |  | $ 8,000,000.0 |  |
Maximum [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Lease terms |  |  | 66 years |  |
Mortgage Lenders [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Associated letter of credit |  |  | $ 0 |  |

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