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Acquisitions, Dispositions, Impairments and Discontinued Operations (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2014 acre | Jul. 31, 2014 acre | Apr. 30, 2014 acre | Jan. 31, 2014 acre | Sep. 30, 2014 | Sep. 30, 2013 acre | Jun. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 acre | Dec. 31, 2013 | Mar. 31, 2014 acre | Oct. 31, 2014 Scenario, Forecast [Member]
Acres of land acquired |  |  | 7.6 | 2.9 |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  | $ 23,800,000 | $ 15,600,000 |  |  |  |  |  |  |  |
Number of operating properties acquired |  |  |  |  |  |  |  |  |  |  |  | 1
Number of apartment units in wholly owned property acquired |  |  |  |  |  |  |  |  |  |  |  | 276
Sales price of property purchased |  |  |  |  |  |  |  |  |  |  |  | 62,600,000
Impairment associated with land holdings |  |  |  |  | 0 | 0 |  | 1,152,000 | 0 |  |  |
Number of operating properties sold |  |  |  |  |  |  |  | 0 |  | 12 |  |
Number of Apartment Units in operating Property Disposed |  |  |  |  |  |  |  |  |  | 3,931 |  |
Acres of land sold | 19.2 | 2.4 | 4.7 |  |  | 3.7 |  |  | 3.7 |  | 3.0 |
Sales price of land parcels | 8,300,000 | 800,000 |  |  |  |  | 14,600,000 |  | 6,600,000 |  |  |
Gain on sale of land |  |  |  |  | $ 1,808,000 | $ 0 | $ 1,801,000 | $ 3,609,000 | $ 698,000 |  |  |
Document Period End Date |  |  |  |  |  |  |  | Sep. 30, 2014 |  |  |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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