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Investments In Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 1 Months Ended | 3 Months Ended
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Apr. 30, 2013 | Jan. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | May 31, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Jun. 30, 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 |  |  |  |  | 4 |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  |  | 15.00% | 20.00% |  |
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Fees earned for property and asset management, construction, development, and other services to joint ventures |  |  | 2,400,000 | 3,300,000 | 5,100,000 | 6,100,000 |  |  |  |  |
Number of operating properties sold | 1 | 1 |  |  |  |  | 11 |  |  | 14 |
Number of apartment homes in operating properties sold | 526 | 770 |  |  |  |  | 3,213 |  |  | 3,098 |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  | 200,200,000 |
Gain (loss) on sale of unconsolidated JV property |  |  |  |  |  |  |  |  |  | 13,000,000 |
Promoted equity interest in assets sold during period |  |  |  |  |  |  |  |  |  |  | $ 3,800,000

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