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Debt Obligations Debt Obligations (Tables) | 3 Months Ended
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Mar. 31, 2013
Debt Disclosure [Abstract] |
Consolidated Debt Obligations [Table Text Block] | The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at March 31, 2013 and December 31, 2012 (in thousands):
Property / Location | March 31, 2013 |  | December 31, 2012 |  | Effective Interest Rate |  |  |  | Maturity Date
MORTGAGE DEBT: |  |  |  |  |  |  |  |  |
Tysons Corner | 92,732 |  |  | 93,188 |  |  | 5.36 | % |  | (a) |  | Aug-15
Two Logan Square | 89,133 |  |  | 89,340 |  |  | 7.57 | % |  |  |  | Apr-16
Fairview Eleven Tower | 21,939 |  |  | 22,000 |  |  | 4.25 | % |  |  |  | Jan-17
IRS Philadelphia Campus | 195,608 |  |  | 197,111 |  |  | 7.00 | % |  |  |  | Sep-30
Cira South Garage | 41,765 |  |  | 42,303 |  |  | 7.12 | % |  |  |  | Sep-30
Principal balance outstanding | 441,177 |  |  | 443,942 |  |  |  |  |  |  |  |
Plus: fair market value premiums (discounts), net | (877 | ) |  | (968 | ) |  |  |  |  |  |  |
Total mortgage indebtedness | $ | 440,300 |  |  | $ | 442,974 |  |  |  |  |  |  |  |
UNSECURED DEBT: |  |  |  |  |  |  |  |  |  |
Credit Facility | — |  |  | 69,000 |  |  | LIBOR + 1.50% |  |  |  |  | Feb-16
Three-Year Term Loan - Swapped to fixed | 150,000 |  |  | 150,000 |  |  | 2.60 | % |  |  |  | Feb-15
Four-Year Term Loan - Variable | 100,000 |  |  | 100,000 |  |  | LIBOR + 1.75% |  |  |  |  | Feb-16
Seven-Year Term Loan - Swapped to fixed | 200,000 |  |  | 200,000 |  |  | 3.62 | % |  |  |  | Feb-19
$250.0M 5.400% Guaranteed Notes due 2014 | 238,379 |  |  | 238,379 |  |  | 5.53 | % |  |  |  | Nov-14
$250.0M 7.500% Guaranteed Notes due 2015 | 166,535 |  |  | 166,535 |  |  | 7.76 | % |  |  |  | May-15
$250.0M 6.000% Guaranteed Notes due 2016 | 150,429 |  |  | 150,429 |  |  | 5.95 | % |  |  |  | Apr-16
$300.0M 5.700% Guaranteed Notes due 2017 | 300,000 |  |  | 300,000 |  |  | 5.68 | % |  |  |  | May-17
$325.0M 4.950% Guaranteed Notes due 2018 | 325,000 |  |  | 325,000 |  |  | 5.13 | % |  |  |  | Apr-18
$250.0M 3.950% Guaranteed Notes due 2023 | 250,000 |  |  | 250,000 |  |  | 4.02 | % |  |  |  | Feb-23
Indenture IA (Preferred Trust I) | 27,062 |  |  | 27,062 |  |  | 2.75 | % |  |  |  | Mar-35
Indenture IB (Preferred Trust I) | 25,774 |  |  | 25,774 |  |  | 3.30 | % |  |  |  | Apr-35
Indenture II (Preferred Trust II) | 25,774 |  |  | 25,774 |  |  | 3.09 | % |  |  |  | Jul-35
Principal balance outstanding | 1,958,953 |  |  | 2,027,953 |  |  |  |  |  |  |  |
plus: original issue premium (discount), net | (5,321 | ) |  | (5,597 | ) |  |  |  |  |  |  |
Total unsecured indebtedness | $ | 1,953,632 |  |  | $ | 2,022,356 |  |  |  |  |  |  |  |
Total Debt Obligations | $ | 2,393,932 |  |  | $ | 2,465,330 |  |  |  |  |  |  |  |
Summary Of Debt Repurchases [Table Text Block] |
Schedule of Extinguishment of Debt [Table Text Block] | As of March 31, 2013, the Company’s aggregate scheduled principal payments on debt obligations, excluding amortization of discounts and premiums, were as follows (in thousands):
2013 | $ | 8,473 |
2014 | 250,321 |
2015 | 416,568 |
2016 | 347,038 |
2017 | 330,323 |
Thereafter | 1,047,407 |
Total principal payments | 2,400,130 |
Net unamortized premiums/(discounts) | (6,198 | )
Outstanding indebtedness | $ | 2,393,932 |

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