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Secured Debt (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Secured Debt (Textual) [Abstract]
Secured debt amount which encumbers real estate owned based upon book value	$ 2,300,000,000	$ 2,300,000,000
Percentage of secured debt which encumbers real estate owned based upon book value	29.80%	29.80%
Secured debt amount of real estate owned which is unencumbered	5,400,000,000	5,400,000,000
Percentage of secured debt of real estate owned which is unencumbered	70.20%	70.20%
Number of secured credit facilities	3
Credit facilities with aggregate commitment	932,800,000	932,800,000
Secured debt including debt on real estate held for sale	1,442,361,000	1,442,361,000	1,891,553,000
Initial term of credit facilities (in years)	10 years
Weighted average interest rate		4.35%
Unamortized fair market adjustment	19,500,000	19,500,000	24,100,000
Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	1,098,837,000	1,098,837,000	1,334,717,000
Weighted average interest rate		5.20%
Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	343,524,000	343,524,000	556,836,000
Weighted average interest rate		1.63%
Mortgage notes payable [Member] | Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	466,266,000	466,266,000	590,208,000
Weighted average interest rate		5.31%
Debt Instrument, Maturity Date Range, Start	10/31/2012
Debt instrument, maturity date range, end	5/31/2019
Notes payable minimum interest rates range	3.43%
Notes payable maximum interest rates range	6.54%
Mortgage notes payable [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	37,415,000	37,415,000	151,685,000
Weighted average interest rate		1.06%
Debt instrument, maturity date range, end	July 2013
Notes payable minimum interest rates range	1.06%
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	94,700,000	94,700,000	94,700,000
Weighted average interest rate		0.85%
Tax Exempt Secured Notes Payable [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Debt Instrument, Maturity Date Range, Start	8/31/2019
Debt instrument, maturity date range, end	3/31/2030
Notes payable minimum interest rates range	0.71%
Notes payable maximum interest rates range	0.90%
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	632,571,000	632,571,000	744,509,000
Weighted average interest rate		5.12%
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale	$ 211,409,000	$ 211,409,000	$ 310,451,000
Weighted average interest rate		2.08%

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Initial term of credit facilities.

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Secured Debt, Encumbers Real Estate Owned, Amount.

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Secured Debt, Encumbers Real Estate Owned, Percent.

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Secured debt including debt on real estate held for sale.

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Secured Debt, Unencumbered Real Estate Owned, Amount.

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- Definition

The average effective interest rate during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Name Accounting Standards Codification

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-SubTopic 30

-Section 45

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- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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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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- Definition

When presenting a range of maturity dates, the latest date when the outstanding debt instruments are required to be repaid. May be presented in a variety of ways (for example: year only, month and year, day, month and year, and number of years).

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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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