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Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010
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Consolidated debt obligations |  |  |  |
Net unamortized premiums/(discounts) | $ (6,507) |  |  |
Less: unamortized exchangeable debt discount |  |  |  | (900)
Total mortgage indebtedness | 511,061 |  |  | 711,789
Total Debt Obligations | 2,393,995 |  |  |
Effective interest rate | 5.50% |  |  | 5.50%
Effective interest rate | LIBOR plus 0.725 |  |  | LIBOR plus 0.725
Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 512,391 |  |  | 712,246
Net unamortized premiums/(discounts) | (1,330) |  |  | (457)
Total mortgage indebtedness | 511,061 |  |  | 711,789
Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 1,888,111 |  |  | 1,722,326
Less: unamortized exchangeable debt discount | 0 |  |  | (906)
Less: unamortized fixed-rate debt discounts, net | (5,177) |  |  | (2,763)
Total unsecured indebtedness | 1,882,934 |  |  | 1,718,657
Total Debt Obligations | 2,393,995 |  |  | 2,430,446
$345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 59,800 |  |  |
$345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 0 |  |  | 59,835
Effective interest rate | 5.50% | [1] |  |
Debt Instrument Maturity Dates | Oct-11 |  |  |
Bank Term Loan [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 37,500 |  |  | 183,000
Effective interest rate | LIBOR+0.80% | [2] |  |
Debt Instrument Maturity Dates | Jun-12 |  |  |
Credit Facility [Member] | Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 275,500 |  |  | 183,000
Effective interest rate | LIBOR+0.725% | [2] |  |
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 | 151,491 |  |  | 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 | 227,329 |  |  | 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 |  | 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 | 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 | LIBOR+1.25% |  |  |
Debt Instrument Maturity Dates | Jul-35 |  |  |
Arboretum I, II, III & V [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 0 |  |  | 20,386
Effective interest rate | 7.59% | [3] |  |
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% | [4] |  |
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% | [5],[6] |  |
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% | [5],[7] |  |
Debt Instrument Maturity Dates | Jan-12 |  |  |
Newtown Square/Berwyn Park/Libertyview [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 56,538 |  |  | 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 | 1,887 |  |  | 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 | 94,882 |  |  | 96,507
Effective interest rate | 5.36% | [5] |  |
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% | [8] |  |
Debt Instrument Maturity Dates | Jul-16 |  |  |
Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross | 22,000 |  |  | 0
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 | 202,905 |  |  | 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 | $ 44,379 |  |  | $ 46,335
Effective interest rate | 7.12% |  |  |
Debt Instrument Maturity Dates | Sep-30 |  |  |
[1] | On October 20, 2011, holders representing $59.5 million of the outstanding Exchangeable Notes exercised their right to cause the Company to redeem their notes at par plus accrued and unpaid interest leaving an outstanding balance of $0.4 million. On December 8, 2011, the Company redeemed the remaining balance of the Exchangeable Notes pursuant to its right under the indenture agreement (see related discussion below).
[2] | On March 31, 2011, the maturity dates of the Bank Term Loan and the Credit Facility were extended to June 29, 2012 from June 29, 2011. On June 29, 2011, the Company paid a total extension fee amounting to $1.2 million which is equal to 15 basis points of the outstanding principal balance of the Bank Term Loan and of the committed amount under the Credit Facility. The extension of the maturity dates was at the Company's option under the Bank Term Loan and the Credit Facility agreements. There were no changes in the terms and conditions of the loan agreements as a result of the maturity date extensions. On December 15, 2011, the Company entered into binding agreements for lender commitments related a new $600.0 million four -year unsecured credit facility (the "New Credit Facility") and three unsecured term loans in the same aggregate amount of $600.0 million (collectively, the “New Term Loans”), consisting of a $150.0 million three-year loan, a $250.0 million four-year loan and a $200.0 million seven-year loan. Please see below for a related discussion regarding the New Credit Facility and Term Loans
[3] | On April 1, 2011, the Company prepaid the remaining balance of the loan without penalty.
[4] | On June 3, 2011, the Company prepaid the remaining balance of the loan without penalty.
[5] | These loans were assumed upon acquisition of the related properties. The interest rates reflect the market rate at the time of acquisition.
[6] | On June 30, 2011, the Company prepaid the remaining balance of the loan without penalty. The unamortized fixed-rate debt premium of $0.3 million related to this loan was included as part of the gain (loss) on early extinguishment of debt in the Company's consolidated statement of operations during the current year.
[7] | On September 1, 2011, the Company prepaid the remaining balance of the loan without penalty. The unamortized fixed-rate debt premium of $0.2 million related to this loan was included as part of the gain (loss) on early extinguishment of debt in the Company's consolidated statement of operations during the year.
[8] | This mortgage was subject to an interest rate floor of 4.50% on a monthly basis. On July 11, 2011, the Company prepaid the balance of the loan without penalty.

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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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