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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Net unamortized premiums/(discounts) | $ (4,409) |  |
Total mortgage indebtedness | 662,478 |  | 670,151
Total Debt Obligations | 2,588,250 |  | 2,595,381
Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 662,956 |  | 669,762
Net unamortized premiums/(discounts) | (478) |  | 389
Total mortgage indebtedness | 662,478 |  | 670,151
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 1,929,703 |  | 1,929,703
Net unamortized premiums/(discounts) | (3,931) |  | (4,473)
Total unsecured indebtedness | 1,925,772 |  | 1,925,230
Unsecured Debt [Member] | Three Year Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 150,000 |  | 150,000
Debt Instrument, Interest Rate, Effective Percentage | 2.60% |  |
Debt Instrument, Maturity Date | Feb. 01, 2015 |  |
Unsecured Debt [Member] | Four-Year Term Loan - Variable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 100,000 |  | 100,000
Debt Instrument, Interest Rate Terms | LIBOR + 1.75% | [1] |
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 |  | 200,000
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 | 218,549 |  | 218,549
Debt Instrument, Interest Rate, Effective Percentage | 5.53% |  |
Debt Instrument, Maturity Date | Nov. 01, 2014 |  |
Unsecured Debt [Member] | $250.0M 7.500% Guaranteed Notes due 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 157,625 |  | 157,625
Debt Instrument, Interest Rate, Effective Percentage | 7.76% |  |
Debt Instrument, Maturity Date | May 15, 2015 |  |
Unsecured Debt [Member] | $250.0M 6.000% Guranteed Notes due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 149,919 |  | 149,919
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 |  | 300,000
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 |  | 325,000
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 |  | 250,000
Debt Instrument, Interest Rate, Effective Percentage | 4.02% |  |
Debt Instrument, Maturity Date | Feb. 15, 2023 |  |
Unsecured Debt [Member] | Indenture IA (Preferred Trust I) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 27,062 |  | 27,062
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 |  | 25,774
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 |  | 25,774
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 | 90,460 |  | 91,395
Debt Instrument, Interest Rate, Effective Percentage | 5.36% | [2] |
Debt Instrument, Maturity Date | Aug. 01, 2015 |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 124,151 |  | 125,089
Debt Instrument, Interest Rate, Effective Percentage | 3.68% | [2] |
Debt Instrument, Maturity Date | Jan. 06, 2016 |  |
Two Logan Square [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 88,174 |  | 88,583
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 | 21,470 |  | 21,630
Debt Instrument, Interest Rate, Effective Percentage | 4.25% | [3] |
Debt Instrument, Maturity Date | Jan. 01, 2017 |  |
Two Commerce Square [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 112,000 |  | 112,000
Debt Instrument, Interest Rate, Effective Percentage | 4.51% | [2] |
Debt Instrument, Maturity Date | Apr. 05, 2023 |  |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 187,751 |  | 190,964
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 | $ 38,950 |  | $ 40,101
Debt Instrument, Interest Rate, Effective Percentage | 7.12% |  |
Debt Instrument, Maturity Date | Sep. 10, 2030 |  |
[1] | London Interbank Offered Rate (“LIBOR”).
[2] | (a)These loans were assumed upon acquisition of the related properties. The interest rate reflects the market rate at the time of acquisition.
[3] | (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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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 4: 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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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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