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Secured and Unsecured Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Secured debt instruments
Weighted average interest rate	3.98%
Long-term Debt	$ 3,628,192	$ 3,628,192	$ 3,523,703
Unsecured Debt	2,228,820	2,228,820	2,081,626
Weighted Average Years to Maturity		4 years 6 months
Line of Credit Facility, Amount Outstanding	2,200	2,200
Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	1,061,926	1,061,926	1,072,373
Weighted average interest rate	5.19%
Weighted Average Years to Maturity		3 years 2 months 29 days
Number of Communities Encumbered	30
Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	337,446	337,446	369,704
Weighted average interest rate	1.39%
Weighted Average Years to Maturity		6 years 2 months 17 days
Number of Communities Encumbered	10
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	438,172	438,172	445,706
Weighted average interest rate	5.47%
Weighted Average Years to Maturity		1 year 9 months 3 days
Number of Communities Encumbered	8
Mortgages Notes Payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	31,337	31,337	63,595
Weighted average interest rate	1.94%
Weighted Average Years to Maturity		2 years 3 months 25 days
Number of Communities Encumbered	1
Tax-exempt secured notes payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	94,700	94,700	94,700
Weighted average interest rate	0.77%
Weighted Average Years to Maturity		8 years 5 months 8 days
Number of Communities Encumbered	2
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding			626,667
Debt, Weighted Average Interest Rate	4.99%	4.99%
Weighted Average Years to Maturity		4 years 3 months 7 days
Number of Communities Encumbered	22
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	211,409	211,409	211,409
Debt Instrument, Interest Rate at Period End	1.58%	1.58%
Weighted Average Years to Maturity		5 years 9 months 7 days
Number of Communities Encumbered	7
Secured Debt [Member]
Secured debt instruments
Principal outstanding	1,399,372	1,399,372	1,442,077
Weighted average interest rate	4.27%
Long-term Debt	1,399,372	1,399,372
Weighted Average Years to Maturity		3 years 11 months 12 days
Number of Communities Encumbered	40
Secured Debt [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Long-term Debt	1,061,926	1,061,926
Secured Debt [Member] | Variable Rate Debt [Member]
Secured debt instruments
Long-term Debt	337,446	337,446
Unsecured Revolving Credit Facility due October 2015 [Member]
Secured debt instruments
Weighted average interest rate	1.10%
Weighted Average Years to Maturity		3 years 2 months 4 days
Line of Credit Facility, Amount Outstanding	160,000	160,000	0
ThreePointSevenTermNotesDueOctober2020 [Member]
Secured debt instruments
Weighted average interest rate		3.70%
Senior Notes	299,952	299,952	299,946
Weighted Average Years to Maturity		6 years
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	397,387	397,387	397,118
Weighted Average Years to Maturity		7 years 3 months 10 days
3.75 MTN Due July 2024 [Member]
Secured debt instruments
Weighted average interest rate	3.75%
Senior Notes	298,983	298,983	0
Weighted Average Years to Maturity		9 years 9 months
1.67% Term Notes due December 2016 [Member]
Secured debt instruments
Weighted average interest rate	1.30%
Senior Notes	35,000	35,000	35,000
Weighted Average Years to Maturity		3 years 8 months 4 days
2.68% Term Notes due December 2016 [Member]
Secured debt instruments
Weighted average interest rate	1.53%
Senior Notes	100,000	100,000	65,000
Weighted Average Years to Maturity		3 years 8 months 4 days
Six Point Zero Five Percent, Medium Term Notes, Due June 2013 [Member]
Secured debt instruments
Weighted Average Years to Maturity		0 months 0 days
Five Point One Three Percent, Medium Term Notes, Due January 2014 [Member]
Secured debt instruments
Weighted average interest rate	0.00%
Senior Notes	0	0	184,000
Weighted Average Years to Maturity		0 days
Five Point Five Zero Percent, Medium Term Notes, Due April 2014 [Member]
Secured debt instruments
Weighted average interest rate	0.00%
Senior Notes	0	0	128,480
Weighted Average Years to Maturity		0 months
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member]
Secured debt instruments
Weighted average interest rate	5.25%
Senior Notes	325,138	325,138	325,041
Weighted Average Years to Maturity		3 months 14 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	83,260
Weighted Average Years to Maturity		1 year 6 months 14 days
2.90% Term Notes due January 2016 [Member]
Secured debt instruments
Weighted average interest rate	2.17%
Senior Notes	215,000	215,000	250,000
Weighted Average Years to Maturity		3 years 8 months 4 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	15,644
Weighted Average Years to Maturity		9 years 11 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	298,428	298,428	298,107
Weighted Average Years to Maturity		3 years 8 months 1 day
Other [Member]
Secured debt instruments
Senior Notes	28	28	30
Unsecured Debt [Member]
Secured debt instruments
Weighted average interest rate	3.80%
Long-term Debt	2,228,820	2,228,820
Unsecured Debt	2,228,820	2,228,820	2,081,626
Weighted Average Years to Maturity		4 years 10 months 24 days
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	623,754	623,754
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	$ 211,409

X

- Definition

Debt instrument weighted average years to maturity.

+ References

No definition available.

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Number of Communities Encumbered.

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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 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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Article 5



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-SubTopic 10

-Section S99

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Name Accounting Standards Codification

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- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

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-Subparagraph (SX 210.9-03.16)

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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.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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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 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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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 9

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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).

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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