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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of Significant Accounting Policies and Recent Accounting Pronouncements
Capitalized interest	$ 1.8	$ 1.3	$ 3.6	$ 2.6
Capitalized real estate taxes	$ 0.3	$ 0.2	$ 0.7	$ 0.5
Percentage of rental revenue and other income from leasing of apartment homes				98.00%

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Capitalized real estate taxes.

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- Definition

Percentage of our total property revenues and total non-property income from leasing of apartment homes, excluding income on deferred compensation plans.

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- Definition

The amount of interest that was capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 34
-Paragraph 21
-Subparagraph b

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