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Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 07, 2016 USD ($) ft² | Jan. 14, 2016 USD ($) ft² | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Apr. 02, 2016 | Dec. 31, 2015 USD ($) | Dec. 20, 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, net |  |  |  | $ 322,623 |  | $ 322,623 |  |  | $ 545,753 |
Loss on early extinguishment of debt - deferred financing costs |  |  |  |  |  | 13,157 | $ 0 |  |  |
Loss on early extinguishment of debt |  |  | $ (66,600) | 0 | $ 0 | (66,590) | $ 0 |  |  |
Unsecured Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 195,000 |  |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 326,242 |  | 326,242 |  |  | 562,695 |
Secured Debt [Member] | Cira Square and Cira South Garage [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | 265,800 |  |  |  |  |  |  |
Secured Debt [Member] | Cira Square [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 176,900 |  |  |  |  |  |  |
Repayment of prepayment charges |  |  | $ 44,500 |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 10, 2030 |  |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  | $ 10,800 |  |  |  |  |  |  |
Secured Debt [Member] | Cira South Garage [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | 44,400 |  |  |  |  |  |  |
Repayments of debt |  |  | 35,500 |  |  |  |  |  |  |
Repayment of prepayment charges |  |  | $ 8,900 |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 10, 2030 |  |  |  |  |  |  |
Number of Parking Spaces | ft² |  |  | 1,662 |  |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  | $ 2,400 |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 1,703,610 |  | $ 1,703,610 |  |  | 1,853,529 |
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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Loan interest rate |  | 7.57% |  |  |  |  |  |  |  |
Brandywine - AI Venture LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment percentage |  |  |  |  |  |  |  |  |  | 50.00%
3141 Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | [1] |  |  |  |  |  |  |  | $ 20,838 |
Debt instrument maturity date | [1] |  |  |  |  | Jan. 01, 2017 |  |  |  |
Effective interest rate | [1] |  |  | 4.25% |  | 4.25% |  |  |  |
3141 Fairview Eleven Tower [Member] | Brandywine - AI Venture LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment percentage |  |  |  | 50.00% |  | 50.00% |  |  |  |
[1] | 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.

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