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Investments In Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended						3 Months Ended				12 Months Ended			1 Months Ended
	Feb. 28, 2014	Jan. 31, 2014 acre	Dec. 31, 2013	Jun. 30, 2013 acre	Jan. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012 acre	Dec. 31, 2011	May 31, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Number of joint ventures accounted for under equity method investments											2	4	17
Equity method investment ownership percentage			20.00%			20.00%	20.00%				20.00%		20.00%
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures			$ 0				$ 0				$ 0
Fees earned for property and asset management, construction, development, and other services to joint ventures											10,000,000	11,400,000	9,300,000
Acres of land acquired		2.9		38.8								22.6
Number of operating properties sold			2		12	2					16	11		14
Number of apartment homes in operating properties sold	240		600			788					3,931	3,213		3,098
Sales price of property sold by unconsolidated joint venture			68,700,000											200,200,000
Gain on sale of property by unconsolidated joint venture			3,200,000				3,245,000	13,032,000	14,543,000	2,875,000				13,100,000
Promoted equity interest														$ 5,100,000

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Acres of land acquired by the company during the period to be utilized in the development of multiple multifamily apartment communities.

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Revenue earned by providing property management, construction, development, and other services to joint ventures.

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Our proportionate share of the gain (loss) on the sale of an unconsolidated joint venture property or properties during the period. Gain (loss) is included in equity in income (loss) on the income statement.

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Number of apartment units in property disposed of or held for sale during the period.

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Number of joint ventures accounted for under equity method investments.

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Number of operating properties sold during the period.

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Promote income recognized in equity in income (loss) of joint ventures within our consolidated statements of income earned as a result of achieving certain performance measures as set forth in the joint venture agreement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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