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Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) |  |  |  | 12 Months Ended |  |
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Apr. 07, 2016 USD ($) ft² | Jan. 14, 2016 USD ($) ft² | Dec. 29, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Apr. 02, 2016 | Dec. 20, 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, net |  |  |  |  | $ 321,549,000 |  | $ 545,753,000 |  |  |
Extinguishment of Debt, Amount |  |  |  |  | 0 |  | 0 | $ 376,174,000 |  |
Loss on early extinguishment of debt - deferred financing costs |  |  |  |  |  |  |  | 152,000 |  |
Loss on early extinguishment of debt |  |  | $ (66,600,000) |  | (66,590,000) |  | 0 | $ (7,594,000) |  |
Unsecured Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 195,000,000 |  |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 325,038,000 |  | 562,695,000 |  |  |
Extinguishment of Debt, Amount |  |  | 44,400,000 |  |  |  |  |  |  |
Repayments of debt |  |  | 35,500,000 |  |  |  |  |  |  |
Repayment of prepayment charges |  |  | 8,900,000 |  |  |  |  |  |  |
Secured Debt [Member] | Cira Square and Cira South Garage [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 265,800,000 |  |  |  |  |  |  |
Secured Debt [Member] | Cira Square [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 10, 2030 |  |  |  |  |  |  |
Repayments of debt |  |  | $ 176,900,000 |  |  |  |  |  |  |
Repayment of prepayment charges |  |  | 44,500,000 |  |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  | $ 10,800,000 |  |  |  |  |  |  |
Secured Debt [Member] | Cira South Garage [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 10, 2030 |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 44,400,000 |  |  |  |  |  |  |
Repayments of debt |  |  | 35,500,000 |  |  |  |  |  |  |
Repayment of prepayment charges |  |  | $ 8,900,000 |  |  |  |  |  |  |
Number of Parking Spaces | ft² |  |  | 1,662 |  |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  | $ 2,400,000 |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 1,703,610,000 |  | 1,853,529,000 |  |  |
Effective interest rate |  |  |  |  |  |  |  |  | 6.00% |
First Mortgage [Member] | Mortgage Loans over $1,000,000 [Member] | Office Building at Two Logan Square [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, net |  | $ 86,900,000 |  |  |  |  |  |  |  |
Net Rentable Square Feet | ft² |  | 708,844 |  |  |  |  |  |  |  |
Former First Mortgage [Member] | Mortgage Loans over $1,000,000 [Member] | Office Building at Two Logan Square [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 86,600,000 |  |  |  |  |  |  |  |
Loan interest rate |  | 7.57% |  |  |  |  |  |  |  |
Brandywine - AI Venture LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment percentage |  |  |  |  | 50.00% | [1],[2] |  |  |  | 50.00%
Effective interest rate | [2] |  |  |  | 3.96% |  |  |  |  |
3141 Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | [3] |  |  |  | $ 0 |  | 20,838,000 |  |  |
Debt instrument maturity date | [3] |  |  |  | Jan. 01, 2017 |  |  |  |  |
Effective interest rate | [3] |  |  |  | 4.25% |  |  |  |  |
3141 Fairview Eleven Tower [Member] | Brandywine - AI Venture LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment percentage |  |  |  |  | 50.00% |  |  |  |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 127,026,000 |  | $ 130,000,000 |  |  |
Debt instrument increase in principal |  |  |  | $ 130,000,000 |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  | Apr. 05, 2023 |  |  |  |  |
Effective interest rate |  |  |  |  | 3.64% | [4] | 3.64% |  |  |
[1] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.
[2] | See “Brandywine AI Venture: 3141 Fairview Park Drive” section below for information discussing activity that occurred during 2016 relating to this venture.
[3] | On August 31, 2016, the Company deconsolidated 3141 Fairview Park Drive and began accounting for it under the equity method of accounting as part of Brandywine - AI Venture LLC, an unconsolidated real estate venture in which the Company holds a 50% interest. At December 31, 2015, this balance represented the full debt amount of the property, as it was consolidated at that time. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further details.
[4] | This loan was assumed upon acquisition of the related properties on December 19, 2013. On December 29, 2015, the Company refinanced the debt increasing the principal balance to $130.0 million and extended the term from the scheduled maturity from January 6, 2016 to April 5, 2023. The effective interest rate as of December 31, 2015 was 3.64%. A default under this loan will also constitute a default under the loan outstanding on Two Commerce Square. This loan is also secured by a lien on Two Commerce Square.

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