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Debt Obligations (Details Textuals) (USD $) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2011 | Dec. 31, 2010 | Mar. 31, 2011 | Sep. 30, 2011 One Logan Square [Member] Secured Debt [Member] | Sep. 30, 2011 Letter of Credit [Member] Unsecured Debt [Member] | Jun. 29, 2011 Bank Term Loan and the Credit Facility [Member] | Sep. 30, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Sep. 30, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] Unsecured Debt [Member] | Sep. 30, 2011 $300.0M 5.750% Guaranteed Notes due 2012 [Member] | Sep. 30, 2011 $250.0M 5.400% Guaranteed Notes due 2014 [Member] | Sep. 30, 2011 $250.0M 7.500% Guaranteed Notes due 2015 [Member] | Sep. 30, 2011 $250.0M 6.000% Guaranteed Notes due 2016 [Member] | Sep. 30, 2011 $300.0M 5.700% Guaranteed Notes due 2017 [Member] | Sep. 30, 2011 $325.0M 4.950% Guaranteed Notes due 2018 [Member] | Sep. 30, 2011 Secured Debt [Member] | Sep. 30, 2010 Secured Debt [Member] | Sep. 30, 2011 Unsecured Debt [Member] | Sep. 30, 2010 Unsecured Debt [Member]
Debt obligations (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 345.0 |  | $ 300.0 | $ 250.0 | $ 250.0 | $ 250.0 | $ 300.0 | $ 325.0 |  |  |  |
Interest rate floor on a monthly basis | 5.50% | 5.50% |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Maturity Date |  |  |  |  |  | Jun. 29, 2011 |  | Oct. 20, 2011 |  |  |  |  |  |  |  |  |  |
Extended Maturity date |  |  |  |  |  | Jun. 29, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Redemption price under right to redeem guaranteed exchangeable notes |  |  |  |  |  |  |  | 100% of the principal amount of the Exchangeable Notes plus accrued and unpaid interest |  |  |  |  |  |  |  |  |  |
Guaranteed Exchangeable Notes tendered and accepted for purchase |  |  |  |  |  |  |  | 59.5 |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of the notes to be redeemed |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Weighted average effective interest rate on mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.83% | 6.62% | 0.98% | 1.14%
Extension fee |  |  |  |  |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |
Payment of extension fee under the Credit Facility |  |  |  |  |  | 15 basis points of the committed amount under the Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount by which the Company may increase its credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800.0 |
Borrowings under the credit facility |  |  |  |  | 10.6 |  |  |  |  |  |  |  |  |  |  |  | 166.0 |
Unused availability under the Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 423.4 |
Weighted-average interest rate on credit facility borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.83% | 6.62% | 0.98% | 1.14%
Weighted average interest rate on the Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.95% | 0.98%
Interest rate on Loans |  |  | 4.95% |  |  |  | 3.875% |  | 5.75% | 5.40% | 7.50% | 6.00% | 5.70% | 4.95% |  |  |  |
Initial exchange rate for Guaranteed Exchangeable Notes |  |  |  |  |  |  |  | 25.4065 shares per $1,000 principal amount of notes |  |  |  |  |  |  |  |  |  |
Initial exchange price per share |  |  |  |  |  |  |  | $ 39.36 |  |  |  |  |  |  |  |  |  |
Carrying amount of the equity component |  |  |  |  |  |  | $ 24.4 |  |  |  |  |  |  |  |  |  |  |

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