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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Oct. 07, 2015 | Dec. 31, 2015 | Oct. 08, 2015 | Dec. 31, 2014
Consolidated debt obligations |  |  |  |  |  |
Plus: premiums/(discounts), net | $ (8,912) | $ (8,912) |  | $ (8,912) |  |
Less: deferred financing costs | (22,595) | (22,595) |  | (22,595) |  |
Total Debt Obligations | $ 2,384,717 | $ 2,384,717 |  | $ 2,384,717 |  | $ 2,427,345
Effective interest rate | 0.00% | 0.00% |  | 0.00% |  |
Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 562,695 | $ 562,695 |  | $ 562,695 |  | 655,934
Plus: premiums/(discounts), net | (3,198) | (3,198) |  | (3,198) |  | (1,344)
Less: deferred financing costs | (13,744) | (13,744) |  | (13,744) |  | (14,959)
Total mortgage indebtedness | 545,753 | 545,753 |  | 545,753 |  | 639,631
Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | 1,853,529 | 1,853,529 |  | 1,853,529 |  | 1,803,529
Plus: premiums/(discounts), net | (5,714) | (5,714) |  | (5,714) |  | (6,811)
Less: deferred financing costs | (8,851) | (8,851) |  | (8,851) |  | (9,004)
Total unsecured indebtedness | 1,838,964 | 1,838,964 |  | 1,838,964 |  | 1,787,714
Tysons Corner [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 0 | $ 0 |  | $ 0 |  | 89,513
Effective interest rate | 5.36% | 5.36% |  | 5.36% |  |
Debt Instrument Maturity Date |  |  |  | Oct. 09, 2015 |  |
Two Logan Square [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 86,886 | $ 86,886 |  | $ 86,886 |  | 87,767
Effective interest rate | 7.57% | 7.57% |  | 7.57% |  |
Debt Instrument Maturity Date |  |  |  | Apr. 01, 2016 |  |
Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 20,838 | $ 20,838 |  | $ 20,838 |  | 21,242
Effective interest rate | 4.25% | 4.25% |  | 4.25% |  |
Debt Instrument Maturity Date |  |  |  | Jan. 01, 2017 |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 130,000 | $ 130,000 |  | $ 130,000 |  | 123,205
Effective interest rate | 3.64% | 3.64% |  | 3.64% |  |
Debt Instrument Maturity Date | Apr. 05, 2023 |  |  | Jan. 06, 2016 |  |
Two Commerce Square [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 112,000 | $ 112,000 |  | $ 112,000 |  | 112,000
Effective interest rate | 4.51% | 4.51% |  | 4.51% |  |
Debt Instrument Maturity Date |  |  |  | Apr. 05, 2023 |  |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 177,425 | $ 177,425 |  | $ 177,425 |  | 184,442
Effective interest rate | 7.00% | 7.00% |  | 7.00% |  |
Debt Instrument Maturity Date |  |  |  | Sep. 10, 2030 |  |
Cira South Garage [Member] | Secured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 35,546 | $ 35,546 |  | $ 35,546 |  | 37,765
Effective interest rate | 7.12% | 7.12% |  | 7.12% |  |
Debt Instrument Maturity Date |  |  |  | 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 | $ 200,000 | $ 250,000 | $ 250,000 | 200,000
Effective interest rate | 3.72% | 3.72% |  | 3.72% | 3.72% |
Debt Instrument Maturity Date |  | Oct. 08, 2022 | Feb. 01, 2019 |  |  |
$250.0M 6.00% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 149,919 | $ 149,919 |  | $ 149,919 |  | 149,919
Effective interest rate | 5.95% | 5.95% |  | 5.95% |  |
Debt Instrument Maturity Date |  |  |  | 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 |  | $ 300,000 |  | 300,000
Effective interest rate | 5.68% | 5.68% |  | 5.68% |  |
Debt Instrument Maturity Date |  |  |  | May 01, 2017 |  |
$325.0M 4.95% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 325,000 | $ 325,000 |  | $ 325,000 |  | 325,000
Effective interest rate | 5.13% | 5.13% |  | 5.13% |  |
Debt Instrument Maturity Date |  |  |  | Apr. 15, 2018 |  |
$250M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 250,000 | $ 250,000 |  | $ 250,000 |  | 250,000
Effective interest rate | 4.02% | 4.02% |  | 4.02% |  |
Debt Instrument Maturity Date |  |  |  | Feb. 15, 2023 |  |
250.0M 4.10% Guaranteed Notes due 2024 [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 250,000 | $ 250,000 |  | $ 250,000 |  | 250,000
Effective interest rate | 4.33% | 4.33% |  | 4.33% |  |
Debt Instrument Maturity Date |  |  |  | Oct. 01, 2024 |  |
$250M 4.55% Guaranteed Notes due 2029 [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 250,000 | $ 250,000 |  | $ 250,000 |  | 250,000
Effective interest rate | 4.60% | 4.60% |  | 4.60% |  |
Debt Instrument Maturity Date |  |  |  | Oct. 01, 2029 |  |
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Consolidated debt obligations |  |  |  |  |  |
Long-term Debt, Gross | $ 27,062 | $ 27,062 |  | $ 27,062 |  | 27,062
Effective interest rate | 2.75% | 2.75% |  | 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 |  | $ 25,774 |  | 25,774
Effective interest rate | 3.30% | 3.30% |  | 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 |  | $ 25,774 |  | $ 25,774
Effective interest rate | 3.09% | 3.09% |  | 3.09% |  |
Debt Instrument Maturity Date |  |  |  | Jul. 30, 2035 |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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