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Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 59,800 | $ 59,800
Net unamortized premiums/(discounts) | (7,068) |
Less: unamortized exchangeable debt discount | 100 | 900
Total mortgage indebtedness | 491,867 | 711,789
Total Debt Obligations | 2,492,227 |
Effective interest rate | LIBOR plus 0.725% |
Arboretum I, II, III & V [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 0 | 20,386
Effective interest rate | 7.59% |
Debt Instrument Maturity Dates | Jul-11 |
Midlantic Drive/Lenox Drive/DCC I [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 0 | 56,514
Effective interest rate | 8.05% |
Debt Instrument Maturity Dates | Oct-11 |
Research Office Center [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 0 | 39,145
Effective interest rate | 5.30% |
Debt Instrument Maturity Dates | Oct-11 |
Concord Airport Plaza [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 0 | 34,494
Effective interest rate | 5.55% |
Debt Instrument Maturity Dates | Jan-12 |
Newtown Square/Berwyn Park/Libertyview [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 56,940 | 58,102
Effective interest rate | 7.25% |
Debt Instrument Maturity Dates | May-13 |
Southpoint III [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 2,070 | 2,597
Effective interest rate | 7.75% |
Debt Instrument Maturity Dates | Apr-14 |
Tysons Corner [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 95,299 | 96,507
Effective interest rate | 5.36% |
Debt Instrument Maturity Dates | Aug-15 |
Two Logan Square [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 89,800 | 89,800
Effective interest rate | 7.57% |
Debt Instrument Maturity Dates | Apr-16 |
One Logan Square [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 0 | 60,000
Effective interest rate | 4.50% |
Debt Instrument Maturity Dates | Jul-16 |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 204,301 | 208,366
Effective interest rate | 7.00% |
Debt Instrument Maturity Dates | Sep-30 |
Cira South Garage [Member] | Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 44,879 | 46,335
Effective interest rate | 7.12% |
Debt Instrument Maturity Dates | Sep-30 |
$345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 59,835 | 59,835
Effective interest rate | 5.50% |
Debt Instrument Maturity Dates | Oct-11 |
Bank Term Loan [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 183,000 | 183,000
Effective interest rate | LIBOR + 0.800% |
Debt Instrument Maturity Dates | Jun-12 |
Credit Facility [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 166,000 | 183,000
Effective interest rate | LIBOR + 0.725% |
Debt Instrument Maturity Dates | Jun-12 |
$300.0M 5.750% Guaranteed Notes due 2012 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 152,296 | 175,200
Effective interest rate | 5.73% |
Debt Instrument Maturity Dates | Apr-12 |
$250.0M 5.400% Guaranteed Notes due 2014 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 242,681 | 242,681
Effective interest rate | 5.53% |
Debt Instrument Maturity Dates | Nov-14 |
$250.0M 7.500% Guaranteed Notes due 2015 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 248,585 | 250,000
Effective interest rate | 7.77% |
Debt Instrument Maturity Dates | May-15 |
$250.0M 6.000% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 250,000 | 250,000
Effective interest rate | 5.95% |
Debt Instrument Maturity Dates | Apr-16 |
$300.0M 5.700% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 300,000 | 300,000
Effective interest rate | 5.68% |
Debt Instrument Maturity Dates | May-17 |
$325.0M 4.950% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 325,000 | 0
Effective interest rate | 5.14% |
Debt Instrument Maturity Dates | Apr-18 |
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 27,062 | 27,062
Effective interest rate | LIBOR + 1.25% |
Debt Instrument Maturity Dates | Mar-35 |
Indenture IB (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 25,774 | 25,774
Effective interest rate | LIBOR + 1.25% |
Debt Instrument Maturity Dates | Apr-35 |
Indenture II (Preferred Trust II) [Member] | Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 25,774 | 25,774
Effective interest rate | LIBOR + 1.25% |
Debt Instrument Maturity Dates | May-35 |
Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 493,288 | 712,246
Net unamortized premiums/(discounts) | (1,421) | (457)
Total mortgage indebtedness | 491,867 | 711,789
Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 2,006,007 | 1,722,326
Less: unamortized exchangeable debt discount | (91) | (906)
Less: unamortized fixed-rate debt discounts, net | (5,556) | (2,763)
Total unsecured indebtedness | 2,000,360 | 1,718,657
Total Debt Obligations | $ 2,492,227 | $ 2,430,446

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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 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 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 5: 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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