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Debt Obligations (Details Textuals) (USD $) | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2011 | Dec. 31, 2010 | Mar. 31, 2011 | Jun. 30, 2011 One Logan Square [Member] Secured Debt [Member] | Jun. 30, 2011 Letter of Credit [Member] Unsecured Debt [Member] | Jun. 30, 2011 Bank Term Loan [Member] Credit Facility [Member] | Jul. 29, 2011 Bank Term Loan [Member] Credit Facility [Member] | Jun. 30, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Jun. 30, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] Unsecured Debt [Member] | Jun. 30, 2011 $300.0M 5.750% Guaranteed Notes due 2012 [Member] | Jun. 30, 2011 $250.0M 5.400% Guaranteed Notes due 2014 [Member] | Jun. 30, 2011 $250.0M 7.500% Guaranteed Notes due 2015 [Member] | Jun. 30, 2011 $250.0M 6.000% Guaranteed Notes due 2016 [Member] | Jun. 30, 2011 $300.0M 5.700% Guaranteed Notes due 2017 [Member] | Jun. 30, 2011 $325.0M 4.950% Guaranteed Notes due 2018 [Member] | Jun. 30, 2011 Secured Debt [Member] | Jun. 30, 2010 Secured Debt [Member] | Jun. 30, 2011 Unsecured Debt [Member] | Jun. 30, 2010 Unsecured Debt [Member]
Debt obligations (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 345,000,000 |  | $ 300,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 300,000,000 | $ 325,000,000 |  |  |  |
Interest rate floor on a monthly basis | 0.055 | 0.055 |  | 0.0450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 plus accrued and unpaid interest |  |  |  |  |  |  |  |  |  |
Weighted average effective interest rate on mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.43% |  |
Extension fee |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000,000 |
Borrowings under the credit facility |  |  |  |  | 10,300,000 |  |  |  |  |  |  |  |  |  |  |  |  | 42,000,000 |
Unused availability under the Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 547,700,000 |
Weighted-average interest rate on Credit Facility borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.01% | 1.01%
Weighted average interest rate on the Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.99% | 1.07%
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 |  |  |  |  |  |  |  | $ 24,400,000 |  |  |  |  |  |  |  |  |  |  |

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