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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Net unamortized premiums/(discounts) | $ (4,247) |  |
Total mortgage indebtedness | 666,305 |  | 670,151
Total Debt Obligations | 2,591,806 |  | 2,595,381
Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 666,350 |  | 669,762
Net unamortized premiums/(discounts) | (45) |  | 389
Total mortgage indebtedness | 666,305 |  | 670,151
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 1,929,703 |  | 1,929,703
Net unamortized premiums/(discounts) | (4,202) |  | (4,473)
Total unsecured indebtedness | 1,925,501 |  | 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 Dates | Feb-15 |  |
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 Dates | Feb-16 |  |
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 Dates | Feb-19 |  |
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 Dates | Nov-14 |  |
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 Dates | May-15 |  |
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 Dates | Apr-16 |  |
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 Dates | May-17 |  |
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 Dates | Apr-18 |  |
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 Dates | Feb-23 |  |
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 Dates | Mar-35 |  |
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 Dates | Apr-35 |  |
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 Dates | Jul-35 |  |
Tysons Corner [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 90,918 |  | 91,395
Debt Instrument, Interest Rate, Effective Percentage | 5.36% | [2] |
Debt Instrument Maturity Dates | Aug-15 |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 124,604 |  | 125,089
Debt Instrument, Interest Rate, Effective Percentage | 3.68% | [2] |
Debt Instrument Maturity Dates | Jan-16 |  |
Two Logan Square [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 88,362 |  | 88,583
Debt Instrument, Interest Rate, Effective Percentage | 7.57% |  |
Debt Instrument Maturity Dates | Apr-16 |  |
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 | 21,566 |  | 21,630
Debt Instrument, Interest Rate, Effective Percentage | 4.25% | [3] |
Debt Instrument Maturity Dates | Jan-17 |  |
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 Dates | Apr-23 |  |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 189,370 |  | 190,964
Debt Instrument, Interest Rate, Effective Percentage | 7.00% |  |
Debt Instrument Maturity Dates | Sep-30 |  |
Cira South Garage [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 39,530 |  | $ 40,101
Debt Instrument, Interest Rate, Effective Percentage | 7.12% |  |
Debt Instrument Maturity Dates | Sep-30 |  |
[1] | (c)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 joint 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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- Definition The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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