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Secured Debt (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Secured debt instruments
Principal outstanding	$ 1,442,361	$ 1,891,553
Weighted Average Interest Rate	4.35%
Weighted Average Years to Maturity	5.6
Number of Communities Encumbered	43
Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	1,098,837	1,334,717
Weighted Average Interest Rate	5.20%
Weighted Average Years to Maturity	5.2
Number of Communities Encumbered	32
Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	343,524	556,836
Weighted Average Interest Rate	1.63%
Weighted Average Years to Maturity	6.6
Number of Communities Encumbered	11
Mortgage notes payable [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	466,266	590,208
Weighted Average Interest Rate	5.31%
Weighted Average Years to Maturity	3.8
Number of Communities Encumbered	9
Mortgage notes payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	37,415	151,685
Weighted Average Interest Rate	1.06%
Weighted Average Years to Maturity	1.0
Number of Communities Encumbered	2
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	94,700	94,700
Weighted Average Interest Rate	0.85%
Weighted Average Years to Maturity	10.1
Number of Communities Encumbered	2
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	632,571	744,509
Weighted Average Interest Rate	5.12%
Weighted Average Years to Maturity	6.3
Number of Communities Encumbered	23
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	$ 211,409	$ 310,451
Weighted Average Interest Rate	2.08%
Weighted Average Years to Maturity	6.1
Number of Communities Encumbered	7

X

- Definition

Debt instrument weighted average years to maturity.

+ References

No definition available.

+ Details

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- Definition

Number of Communities Encumbered.

+ References

No definition available.

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X

- Definition

Secured debt including debt on real estate held for sale.

+ References

No definition available.

+ Details

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X

- Definition

The average effective interest rate during the reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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