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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Apr. 02, 2016 | Dec. 31, 2015
Consolidated debt obligations |  |  |  |
Total Debt Obligations |  | $ 2,013,561 |  | $ 2,384,717
Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | 326,242 |  | 562,695
Plus: premiums/(discounts), net |  | (2,870) |  | (3,198)
Less: deferred financing costs |  | (749) |  | (13,744)
Total mortgage indebtedness |  | 322,623 |  | 545,753
Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | 1,703,610 |  | 1,853,529
Plus: premiums/(discounts), net |  | (4,932) |  | (5,714)
Less: deferred financing costs |  | $ (7,740) |  | (8,851)
Effective interest rate |  |  | 6.00% |
3141 Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | [1] |  |  | 20,838
Effective interest rate | [1] | 4.25% |  |
Debt instrument maturity date | [1] | Jan. 01, 2017 |  |
Two Logan Square [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 86,395 |  | 86,886
Effective interest rate | [2] | 3.98% |  |
Debt instrument maturity date |  | May 01, 2020 |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 127,847 |  | 130,000
Effective interest rate |  | 3.64% |  |
Debt instrument maturity date |  | Apr. 05, 2023 |  |
Two Commerce Square [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 112,000 |  | 112,000
Effective interest rate | [3] | 4.51% |  |
Debt instrument maturity date |  | Apr. 05, 2023 |  |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | [4] | $ 0 |  | 177,425
Effective interest rate | [4] | 7.00% |  |
Debt instrument maturity date | [4] | Sep. 10, 2030 |  |
Cira South Garage [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | [4] | $ 0 |  | 35,546
Effective interest rate | [4] | 7.12% |  |
Debt instrument maturity date | [4] | Sep. 10, 2030 |  |
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000
Effective interest rate |  | 3.72% |  |
Debt instrument maturity date |  | Oct. 01, 2022 |  |
$250.0M 6.00% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | [5] |  |  | 149,919
Effective interest rate | [5] | 5.95% |  |
Debt instrument maturity date | [5] | Apr. 01, 2016 |  |
$300.0M 5.70% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 300,000 |  | 300,000
Effective interest rate |  | 5.68% |  |
Debt instrument maturity date |  | Apr. 01, 2016 |  |
$325.0M 4.95% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 325,000 |  | 325,000
Effective interest rate |  | 5.13% |  |
Debt instrument maturity date |  | May 01, 2017 |  |
$250M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000
Effective interest rate |  | 4.02% |  |
Debt instrument maturity date |  | Apr. 15, 2018 |  |
250.0M 4.10% Guaranteed Notes due 2024 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000
Effective interest rate |  | 4.33% |  |
Debt instrument maturity date |  | Feb. 15, 2023 |  |
$250M 4.55% Guaranteed Notes due 2029 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000
Effective interest rate |  | 4.60% |  |
Debt instrument maturity date |  | Oct. 01, 2024 |  |
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 27,062 |  | 27,062
Effective interest rate |  | 2.75% |  |
Debt instrument maturity date |  | Mar. 30, 2035 |  |
Indenture IB (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 25,774 |  | 25,774
Effective interest rate |  | 3.30% |  |
Debt instrument maturity date |  | Apr. 30, 2035 |  |
Indenture II (Preferred Trust II) [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 25,774 |  | $ 25,774
Effective interest rate |  | 3.09% |  |
Debt instrument maturity date |  | Jul. 30, 2035 |  |
[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.
[2] | On April 7, 2016, the Company closed on an $86.9 million first mortgage financing on Two Logan Square, a 708,844-square foot office property located in Philadelphia, Pennsylvania. Proceeds of the loan were used to repay, without penalty, the $86.6 million principal balance of the former Two Logan Square first mortgage loan, which had a 7.57% effective interest rate.
[3] | This loan was assumed upon acquisition of Two Commerce Square on December 19, 2013. The interest rate reflects the market rate at the time of acquisition. A default under this loan will also constitute a default under the loan outstanding on One Commerce Square, and a default under the One Commerce Square loan will also constitute a default under this loan. This loan is also secured by a lien on One Commerce Square and the lien on Two Commerce Square.
[4] | (a) On January 14, 2016, the Company funded $265.8 million to prepay two mortgage loans, consisting of $176.9 million of principal repayment, $44.5 million in prepayment charges and a nominal amount of accrued interest, in repayment of the mortgage indebtedness on the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30th Street Main Post Office (“Cira Square”), ahead of its scheduled maturity date of September 10, 2030. Also on January 14, 2016, the Company funded $44.4 million, consisting of $35.5 million of principal repayment, $8.9 million in prepayment charges and a nominal amount of accrued interest, in repayment of the mortgage indebtedness of a 1,662 parking space facility located in Philadelphia, Pennsylvania commonly known as (“Cira South Garage”), ahead of its scheduled maturity date of September 10, 2030. These repayments were financed with $195.0 million of funds available under the unsecured revolving credit facility with the remaining balance funded through available cash balances. The Company recognized a $66.6 million loss on extinguishment of debt, consisting of the prepayment charges along with $10.8 million and $2.4 million related to non-cash charges for deferred financing costs for Cira Square and Cira South Garage, respectively.
[5] | On April 1, 2016, the entire principal balance of the 2016 6.00% Guaranteed Unsecured Notes was repaid upon maturity. Available cash balances were used to fund the repayment of the unsecured notes.

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