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Secured and Unsecured Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Secured debt instruments
Weighted Average Interest Rate	4.34%
Long-term Debt	$ 3,499,107	$ 3,409,333
Unsecured Debt	2,073,444	1,979,198
Weighted Average Years to Maturity	4 years 2 months 26 days
Line of Credit Facility, Amount Outstanding	840,500
Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	1,082,139	1,086,611
Weighted Average Interest Rate	5.24%
Weighted Average Years to Maturity	4 years 7 months 19 days
Number of Communities Encumbered	31
Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	343,524	343,524
Weighted Average Interest Rate	1.63%
Weighted Average Years to Maturity	6 years 1 month 14 days
Number of Communities Encumbered	11
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	453,076	455,533
Weighted Average Interest Rate	5.41%
Weighted Average Years to Maturity	3 years 3 months 3 days
Number of Communities Encumbered	8
Mortgages Notes Payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	37,415	37,415
Weighted Average Interest Rate	1.09%
Weighted Average Years to Maturity	3 months
Number of Communities Encumbered	2
Tax-exempt secured notes payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	94,700	94,700
Weighted Average Interest Rate	0.87%
Weighted Average Years to Maturity	9 years 11 months 8 days
Number of Communities Encumbered	2
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding		631,078
Debt, Weighted Average Interest Rate	5.11%
Weighted Average Years to Maturity	5 years 6 months 29 days
Number of Communities Encumbered	23
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	211,409	211,409
Debt Instrument, Interest Rate at Period End	2.06%
Weighted Average Years to Maturity	5 years 4 months 2 days
Number of Communities Encumbered	7
Secured Debt [Member]
Secured debt instruments
Principal outstanding	1,425,663	1,430,135
Weighted Average Interest Rate	4.37%
Long-term Debt	1,425,663
Weighted Average Years to Maturity	4 years 11 months 15 days
Number of Communities Encumbered	42
Secured Debt [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Long-term Debt	1,082,139
Secured Debt [Member] | Variable Rate Debt [Member]
Secured debt instruments
Long-term Debt	343,524
Unsecured Revolving Credit Facility due October 2015 [Member]
Secured debt instruments
Weighted Average Interest Rate	1.15%
Weighted Average Years to Maturity	2 years 6 months 21 days
Line of Credit Facility, Amount Outstanding		76,000
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]
Secured debt instruments
Weighted Average Interest Rate	4.63%
Senior Notes	396,849	396,759
Weighted Average Years to Maturity	8 years 9 months 10 days
1.67% Term Notes due December 2016 [Member]
Secured debt instruments
Weighted Average Interest Rate	1.64%
Senior Notes	35,000	35,000
Weighted Average Years to Maturity	2 years 9 months 29 days
2.68% Term Notes due December 2016 [Member]
Secured debt instruments
Weighted Average Interest Rate	2.68%
Senior Notes	65,000	65,000
Weighted Average Years to Maturity	2 years 9 months 29 days
Six Point Zero Five Percent, Medium Term Notes, Due June 2013 [Member]
Secured debt instruments
Weighted Average Interest Rate	6.05%
Senior Notes	122,500	122,500
Weighted Average Years to Maturity	2 months 1 day
Five Point One Three Percent, Medium Term Notes, Due January 2014 [Member]
Secured debt instruments
Weighted Average Interest Rate	5.13%
Senior Notes	184,000	184,000
Weighted Average Years to Maturity	9 months 14 days
Five Point Five Zero Percent, Medium Term Notes, Due April 2014 [Member]
Secured debt instruments
Weighted Average Interest Rate	5.50%
Senior Notes	128,429	128,411
Weighted Average Years to Maturity	1 year
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member]
Secured debt instruments
Weighted Average Interest Rate	5.25%
Senior Notes	324,945	324,913
Weighted Average Years to Maturity	2 years 0 months 15 days
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Secured debt instruments
Weighted Average Interest Rate	5.25%
Senior Notes	83,260	83,260
Weighted Average Years to Maturity	2 years 9 months 14 days
2.90% Term Notes due January 2016 [Member]
Secured debt instruments
Weighted Average Interest Rate	2.90%
Senior Notes	250,000	250,000
Weighted Average Years to Maturity	2 years 9 months 29 days
Eight Point Five Zero Percent, Debentures, Due September 2024 [Member]
Secured debt instruments
Weighted Average Interest Rate	8.50%
Senior Notes	15,644	15,644
Weighted Average Years to Maturity	11 years 5 months 15 days
Four Point Two Five Percentage Medium-Term Notes due June 2018 [Member]
Secured debt instruments
Weighted Average Interest Rate	4.25%
Senior Notes	297,785	297,678
Weighted Average Years to Maturity	5 years 2 months 1 day
Other [Member]
Secured debt instruments
Senior Notes	32	33
Unsecured Debt [Member]
Secured debt instruments
Weighted Average Interest Rate	4.31%
Long-term Debt	2,073,444
Unsecured Debt	2,073,444	1,979,198
Weighted Average Years to Maturity	3 years 9 months
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	629,063
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Unsecured Notes [Member] | Unsecured Revolving Credit Facility due October 2015 [Member]
Secured debt instruments
Line of Credit Facility, Amount Outstanding	170,000
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Line of Credit [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	$ 211,409

X

- Definition

Debt instrument weighted average years to maturity.

+ References

No definition available.

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- Definition

Number of Communities Encumbered.

+ References

No definition available.

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- Definition

Secured debt including debt on real estate held for sale.

+ References

No definition available.

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X

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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))

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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 FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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



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-Name Regulation S-X (SX)

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

+ References

No definition available.

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X

- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



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

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-Name Regulation S-X (SX)

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-Section 03

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 20, 22

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

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



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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



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-Name Accounting Standards Codification

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22



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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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