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Debt Obligations Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Net unamortized premiums/(discounts) | $ (5,817) |
Total mortgage indebtedness | 437,618 | 442,974
Total Debt Obligations | 2,379,745 | 2,465,330
Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 438,404 | 443,942
Net unamortized premiums/(discounts) | (786) | (968)
Total mortgage indebtedness | 437,618 | 442,974
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 1,947,158 | 2,027,953
Net unamortized premiums/(discounts) | (5,031) | (5,597)
Total unsecured indebtedness | 1,942,127 | 2,022,356
Unsecured Debt [Member] | Credit Facility |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 0 | 69,000
Debt Instrument Interest Rates Effective Percentage | LIBOR + 1.50% |
Debt Instrument Maturity Dates | Feb-16 |
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 Rates Effective Percentage | LIBOR + 1.75% |
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] | $250.0M 5.400% Guaranteed Notes due 2014 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 232,199 | 238,379
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 | 161,430 | 166,535
Debt Instrument, Interest Rate, Effective Percentage | 7.76% |
Debt Instrument Maturity Dates | May-15 |
Unsecured Debt [Member] | $250.0M 6.000% Guaranteed Notes due 2016 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 149,919 | 150,429
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 | 92,296 | 93,188
Debt Instrument, Interest Rate, Effective Percentage | 5.36% |
Debt Instrument Maturity Dates | Aug-15 |
Two Logan Square [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 88,960 | 89,340
Debt Instrument, Interest Rate, Effective Percentage | 7.57% |
Debt Instrument Maturity Dates | Apr-16 |
Fairview Eleven Tower [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 21,847 | 22,000
Debt Instrument, Interest Rate, Effective Percentage | 4.25% |
Debt Instrument Maturity Dates | Jan-17 |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 194,083 | 197,111
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 | $ 41,218 | $ 42,303
Debt Instrument, Interest Rate, Effective Percentage | 7.12% |
Debt Instrument Maturity Dates | Sep-30 |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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