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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
	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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Carrying amount of the equity component.

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Debt Obligations Textuals Abstract.

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Extended Maturity date.

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Extension fee

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Initial exchange rate for Guaranteed Exchangeable Notes.

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Payment of an extension fee equal to amount under the Credit Facility.

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Redemption price under Right to redeem Guaranteed Exchangeable Notes.

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Weighted average effective interest rate on mortgage notes payable.

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Weighted-average interest rate on Credit Facility borrowings.

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The price per share of the conversion feature embedded in the debt instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number APB14-1
-Paragraph 32
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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
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When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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Amount borrowed under the credit facility as of the balance-sheet date.

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The effective interest during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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