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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Consolidated debt obligations |  |  |
Plus: premiums/(discounts), net | $ (6,130) |  |
Total mortgage indebtedness | 508,210 |  | 511,061
Total Debt Obligations | 2,674,450 |  | 2,393,995
Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 509,450 |  | 512,391
Plus: premiums/(discounts), net | (1,240) |  | (1,330)
Total mortgage indebtedness | 508,210 |  | 511,061
Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 2,171,130 |  | 1,888,111
Plus: premiums/(discounts), net | (4,890) |  | (5,177)
Total unsecured indebtedness | 2,166,240 |  | 1,882,934
Bank Term Loan [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 0 |  | 37,500
Effective interest rate | LIBOR + 0.80% | [1] |
Debt Instrument Maturity Dates | Feb-12 |  |
Debt instrument, basis spread on variable rate | 0.80% |  |
Former Revolving Credit Facility [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 0 |  | 275,500
Effective interest rate | LIBOR + 0.725% | [1] |
Debt Instrument Maturity Dates | Feb-12 |  |
Debt instrument, basis spread on variable rate | 0.725% |  |
New Revolving Credit Facility [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 0 |  | 0
Effective interest rate | LIBOR + 1.50% | [1] |
Debt Instrument Maturity Dates | Feb-16 |  |
Debt instrument, basis spread on variable rate | 1.50% |  |
Debt Instrument, Term | 4 years |  |
Option to extend Term Loan | 1 year |  |
Three-Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 150,000 |  | 0
Effective interest rate | 2.60% | [1] |
Debt Instrument Maturity Dates | Feb-15 |  |
Debt instrument, basis spread on variable rate | 1.75% |  |
Debt Instrument, Term | 3 years |  |
Option to extend Term Loan | 1 year |  |
Four Year Term Loan [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Debt instrument, basis spread on variable rate | 1.75% |  |
Debt Instrument, Term | 4 years |  |
Option to extend Term Loan | 1 year |  |
Four-Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 150,000 |  | 0
Effective interest rate | 2.88% | [1] |
Debt Instrument Maturity Dates | Feb-16 |  |
Four-Year Term Loan - Variable [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 100,000 |  | 0
Effective interest rate | LIBOR + 1.75% | [1] |
Debt Instrument Maturity Dates | Feb-16 |  |
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 200,000 |  | 0
Effective interest rate | 3.62% | [1] |
Debt Instrument Maturity Dates | Feb-19 |  |
Debt instrument, basis spread on variable rate | 1.90% |  |
Debt Instrument, Term | 7 years |  |
$300.0M 5.750% Guaranteed Notes due 2012 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 151,190 |  | 151,491
Effective interest rate | 5.73% |  |
Debt Instrument Maturity Dates | Apr-12 |  |
Debt instrument stated interest rate | 5.75% |  |
$250.0M 5.400% Guaranteed Notes due 2014 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 239,426 |  | 242,681
Effective interest rate | 5.53% |  |
Debt Instrument Maturity Dates | Nov-14 |  |
Debt instrument stated interest rate | 5.40% |  |
$250.0M 7.500% Guaranteed Notes due 2015 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 226,904 |  | 227,329
Effective interest rate | 7.77% |  |
Debt Instrument Maturity Dates | May-15 |  |
Debt instrument stated interest rate | 7.50% |  |
$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 |  |
Debt instrument stated interest rate | 6.00% |  |
$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 | 5.75% |  |
Debt Instrument Maturity Dates | May-17 |  |
Debt instrument stated interest rate | 5.70% |  |
$325.0M 4.950% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 325,000 |  | 325,000
Effective interest rate | 5.14% |  |
Debt Instrument Maturity Dates | Apr-18 |  |
Debt instrument stated interest rate | 4.95% |  |
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 27,062 |  | 27,062
Effective interest rate | 2.75% |  |
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 | 3.30% |  |
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 | 3.09% |  |
Debt Instrument Maturity Dates | Jul-35 |  |
Newtown Square/Berwyn Park/Libertyview [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 56,130 |  | 56,538
Effective interest rate | 7.25% |  |
Debt Instrument Maturity Dates | May-13 |  |
Southpoint III [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 1,701 |  | 1,887
Effective interest rate | 7.75% |  |
Debt Instrument Maturity Dates | Apr-14 |  |
Tysons Corner [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 94,460 |  | 94,882
Effective interest rate | 5.36% | [2] |
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 |  |
Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 22,000 |  | 22,000
Effective interest rate | 4.25% |  |
Debt Instrument Maturity Dates | Jan-17 |  |
IRS Philadelphia Campus [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross | 201,488 |  | 202,905
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 | $ 43,871 |  | $ 44,379
Effective interest rate | 7.12% |  |
Debt Instrument Maturity Dates | Sep-30 |  |
[1] | On February 1, 2012, the Company closed on a new $600.0 million four-year unsecured credit facility and three unsecured term loans totaling $600.0 million which consist of a $150.0 million three-year loan, a $250.0 million four-year loan and a $200.0 million seven-year loan. The Company used a portion of the net proceeds from the term loans to repay all balances outstanding under its Former Revolving Credit Facility and its former $183.0 million Bank Term Loan which were then retired prior to their scheduled June 29, 2012 maturity.
[2] | This loan was assumed upon acquisition of the related property. The interest rate reflects the market rate at the time of acquisition.

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