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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 16, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Net unamortized premiums/(discounts) | $ (8,080,000) |  |  |
Total mortgage indebtedness | 658,601,000 |  |  | 670,151,000
Total Debt Obligations | 2,713,380,000 |  |  | 2,595,381,000
Line of Credit and Seven Year Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate Terms | Based on the Company's current credit rating, the spread will be 150 basis points under the Credit Facility and 190 basis points under the seven-year term loan. |  |  |
Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 659,512,000 |  |  | 669,762,000
Net unamortized premiums/(discounts) | (911,000) |  |  | 389,000
Total mortgage indebtedness | 658,601,000 |  |  | 670,151,000
Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 2,061,948,000 |  |  | 1,929,703,000
Net unamortized premiums/(discounts) | (7,169,000) |  |  | (4,473,000)
Total unsecured indebtedness | 2,054,779,000 |  |  | 1,925,230,000
Unsecured Debt [Member] | Three Year Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 0 | [1] |  | 150,000,000
Debt Instrument, Interest Rate, Effective Percentage | 2.60% |  |  |
Debt Instrument, Maturity Date | Feb. 01, 2015 |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 150,000,000 |
Unsecured Debt [Member] | Four-Year Term Loan - Swapped to fixed [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 100,000,000 |
Unsecured Debt [Member] | Four-Year Term Loan - Variable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 0 | [1] |  | 100,000,000
Debt Instrument, Interest Rate Terms | LIBOR + 1.75% | [2] |  |
Debt Instrument, Maturity Date | Feb. 01, 2016 |  |  |
Unsecured Debt [Member] | Seven Year Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 200,000,000 |  |  | 200,000,000
Debt Instrument, Face Amount | 200,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.62% |  |  |
Debt Instrument, Maturity Date | Feb. 01, 2019 |  |  |
Unsecured Debt [Member] | 2014 5.400% Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 143,500,000 | [3] |  | 218,549,000
Debt Instrument, Interest Rate, Stated Percentage | 5.40% |  |  |
Debt Instrument, Face Amount | 250,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.53% |  |  |
Debt Instrument, Maturity Date | Nov. 01, 2014 |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 143,500,000 |
Unsecured Debt [Member] | $250.0M 7.500% Guaranteed Notes due 2015 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 114,919,000 | [3] |  | 157,625,000
Debt Instrument, Interest Rate, Stated Percentage | 7.50% |  |  |
Debt Instrument, Face Amount | 250,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 7.76% |  |  |
Debt Instrument, Maturity Date | May 15, 2015 |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 114,900,000 |
Unsecured Debt [Member] | $250.0M 6.000% Guranteed Notes due 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 149,919,000 |  |  | 149,919,000
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |  |
Debt Instrument, Face Amount | 250,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.95% |  |  |
Debt Instrument, Maturity Date | Apr. 01, 2016 |  |  |
Unsecured Debt [Member] | $300.0M 5.700% Guaranteed Notes due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 300,000,000 |  |  | 300,000,000
Debt Instrument, Interest Rate, Stated Percentage | 5.70% |  |  |
Debt Instrument, Face Amount | 300,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.68% |  |  |
Debt Instrument, Maturity Date | May 01, 2017 |  |  |
Unsecured Debt [Member] | $325.0M 4.950% Guaranteed Notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 325,000,000 |  |  | 325,000,000
Debt Instrument, Interest Rate, Stated Percentage | 4.95% |  |  |
Debt Instrument, Face Amount | 325,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.13% |  |  |
Debt Instrument, Maturity Date | Apr. 15, 2018 |  |  |
Unsecured Debt [Member] | $250.0M 3.950% Guaranteed Notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 250,000,000 |  |  | 250,000,000
Debt Instrument, Interest Rate, Effective Percentage | 4.02% |  |  |
Debt Instrument, Maturity Date | Feb. 15, 2023 |  |  |
Unsecured Debt [Member] | Note 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 250,000,000 | [3] |  | 0
Debt Instrument, Interest Rate, Stated Percentage | 4.10% |  |  |
Debt Instrument, Face Amount | 250,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.23% |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2024 |  |  |
Unsecured Debt [Member] | Note 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 250,000,000 | [3] |  | 0
Debt Instrument, Interest Rate, Stated Percentage | 4.60% |  |  |
Debt Instrument, Face Amount | 250,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.60% |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2029 |  |  |
Unsecured Debt [Member] | Indenture IA (Preferred Trust I) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 27,062,000 |  |  | 27,062,000
Debt Instrument, Interest Rate, Effective Percentage | 2.75% |  |  |
Debt Instrument, Maturity Date | Mar. 30, 2035 |  |  |
Unsecured Debt [Member] | Indenture IB (Preferred Trust I) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 25,774,000 |  |  | 25,774,000
Debt Instrument, Interest Rate, Effective Percentage | 3.30% |  |  |
Debt Instrument, Maturity Date | Apr. 30, 2035 |  |  |
Unsecured Debt [Member] | Indenture II (Preferred Trust II) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 25,774,000 |  |  | 25,774,000
Debt Instrument, Interest Rate, Effective Percentage | 3.09% |  |  |
Debt Instrument, Maturity Date | Jul. 30, 2035 |  |  |
Tysons Corner [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 89,995,000 |  |  | 91,395,000
Debt Instrument, Interest Rate, Effective Percentage | 5.36% | [4] |  |
Debt Instrument, Maturity Date | Aug. 01, 2015 |  |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 123,691,000 |  |  | 125,089,000
Debt Instrument, Interest Rate, Effective Percentage | 3.68% | [4] |  |
Debt Instrument, Maturity Date | Jan. 06, 2016 |  |  |
Two Logan Square [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 87,982,000 |  |  | 88,583,000
Debt Instrument, Interest Rate, Effective Percentage | 7.57% |  |  |
Debt Instrument, Maturity Date | Apr. 01, 2016 |  |  |
Fairview Eleven Tower [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 21,373,000 |  |  | 21,630,000
Debt Instrument, Interest Rate, Effective Percentage | 4.25% | [5] |  |
Debt Instrument, Maturity Date | Jan. 01, 2017 |  |  |
Two Commerce Square [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 112,000,000 |  |  | 112,000,000
Debt Instrument, Interest Rate, Effective Percentage | 4.51% | [4] |  |
Debt Instrument, Maturity Date | Apr. 05, 2023 |  |  |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 186,109,000 |  |  | 190,964,000
Debt Instrument, Interest Rate, Effective Percentage | 7.00% |  |  |
Debt Instrument, Maturity Date | Sep. 10, 2030 |  |  |
Cira South Garage [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | $ 38,362,000 |  |  | $ 40,101,000
Debt Instrument, Interest Rate, Effective Percentage | 7.12% |  |  |
Debt Instrument, Maturity Date | Sep. 10, 2030 |  |  |
[1] | (d)On September 16, 2014, the Company repaid all balances outstanding under its $150.0 million three-year term loan and its $100.0 million four-year term loan prior to the scheduled maturity dates of February 1, 2015 and February 1, 2016, respectively.
[2] | (c)London Interbank Offered Rate (“LIBOR”).
[3] | (e)On September 16, 2014, the Company closed on an underwritten offering of $250 million 4.10% Guaranteed Notes due 2024 (the "2-24 Notes") and $250.0 million 4.55% Guaranteed Notes due 2029 (the "2029 Notes"). The Company used the net proceeds, together with cash on hand, to redeem a portion of its 5.40% Guaranteed Notes due November 1, 2014 (the "2014 Notes") and its 7.50% Guaranteed Notes due May 15, 2015 (the "2015 Notes"). (See further discussion below).
[4] | (a)These loans were assumed upon acquisition of the related properties. The interest rate reflects the market rate at the time of acquisition.
[5] | (b)Represents the full debt amount secured by a property owned by a consolidated real estate venture in which the Company holds a 50% interest.

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