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Debt Obligations (Details Textuals 2) (USD $) | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |
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Aug. 26, 2010 | Dec. 31, 2011 Years | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 29, 2009 | Dec. 15, 2011 Credit Facility [Member] | Dec. 31, 2011 Credit Facility [Member] | Dec. 15, 2011 Three-year Term Loan [Member] | Dec. 31, 2011 Three-year Term Loan [Member] | Dec. 15, 2011 Four-year Term Loan [Member] | Dec. 31, 2011 Four-year Term Loan [Member] | Dec. 15, 2011 Seven-year Term Loan [Member] | Dec. 31, 2011 Seven-year Term Loan [Member] | Dec. 31, 2011 Three and Four-year Term Loan [Member] | Dec. 31, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Jun. 29, 2009 IRS Philadelphia Campus [Member] | Jun. 29, 2009 Cira South Garage [Member] | Dec. 31, 2011 IRS Philadelphia Campus and Cira South Garage [Member] | Sep. 10, 2010 IRS Philadelphia Campus and Cira South Garage [Member] | Jun. 29, 2009 IRS Philadelphia Campus and Cira South Garage [Member] | Dec. 31, 2011 Credit Facility Decemeber 2011 [Member] Federal Funds Rate [Member] | Dec. 31, 2011 Unsecured Debt [Member] | Dec. 15, 2011 Unsecured Debt [Member] | Dec. 15, 2011 Unsecured Debt [Member] Three-year Term Loan [Member] | Dec. 15, 2011 Unsecured Debt [Member] Four-year Term Loan [Member] | Dec. 15, 2011 Unsecured Debt [Member] Seven-year Term Loan [Member] | Dec. 31, 2011 Unsecured Debt [Member] $300.0M 5.750% Guaranteed Notes due 2012 [Member] | Dec. 31, 2011 Unsecured Debt [Member] $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 | 150,000,000 | 250,000,000 | 200,000,000 | 300,000,000 | 345,000,000
Debt Instrument, Term |  |  |  |  |  | 4 years |  | 3 years |  | 4 years |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Credit Facility borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 | 150,000,000 | 250,000,000 | 200,000,000 | 300,000,000 | 345,000,000
Repayments of unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 275,500,000 |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.875% |  |  |  | 5.93% |  |  |  |  |  |  |  | 5.75% | 3.875%
Declining prepayment penalty in year one |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declining prepayment penalty in year two |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declining prepayment penalty in year three |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  | 1.50% |  | 1.75% |  | 1.75% |  | 1.90% |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Option to extend Term Loan |  |  |  |  |  |  | 1 year |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Average Fixed Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.623% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, lower fixed interest rate range |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.47% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, higher fixed interest rate range |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.91% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, lower remaining maturity range |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, higher remaining maturity range |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from Issuance of First Mortgage Bond | 254,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward financing commitment |  |  |  |  | 256,500,000 |  |  |  |  |  |  |  |  |  |  | 209,700,000 | 46,800,000 |  |  |  |  |  |  |  |  |  |  |
Loans proceeds withheld pending completion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |
Proceeds from mortgage notes payable retained by lender and included in other receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |
Debt Related Commitment Fees and Debt Issuance Costs | 17,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  | 4,991,000 | 3,770,000 | 5,864,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,900,000 |  |  |  |  |  |  |  |  |  |
Amortization of life of the loan using effective interest rate method in years |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related commitment fees reduced by refund resulting from overpayment |  | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund of deferred financing costs related to forward commitment |  | 0 | 1,659,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other related transaction costs included in total financing costs |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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