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Acquisitions, Dispositions, and Impairment (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) a | May. 31, 2015 USD ($) a | Mar. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) | Apr. 30, 2014 USD ($) a | Mar. 31, 2014 USD ($) a | Jan. 31, 2014 USD ($) a | Jun. 30, 2015 USD ($) a | Mar. 31, 2015 | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) a | Jun. 30, 2014 USD ($)
Area of Land | a | 2.7 | 49.6 |  |  | 7.6 |  | 2.9 | 2.7 |  |  | 2.7 |
Payments to Acquire Land | $ 9,500 | $ 36,300 |  |  | $ 23,800 |  | $ 15,600 |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 0.01% |  |  |  |  |  | 0.01% |  |  |
Number of fully consolidated joint ventures acquired |  |  |  |  |  |  |  |  | 2 |  |  |
Number of apartment units in wholly owned property acquired |  |  | 798 |  |  |  |  |  |  |  |  |
Purchase of non-controlling interests |  |  | $ 9,500 |  |  |  |  |  |  |  | $ 9,500 | $ 0
Impairment associated with land holdings |  |  |  |  |  |  |  | $ 0 |  | $ 1,152 | $ 0 | $ 1,152
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  | 4.7 | 3.0 |  |  |  |  |  |
Sales price of land parcels |  |  | 400 |  | $ 8,300 | $ 6,300 |  |  |  |  |  |
Gain (loss) on disposition of land |  |  | $ 100 |  | $ 1,400 | $ 400 |  |  |  |  |  |
Number of operating properties sold |  |  |  | 2 |  |  |  |  |  |  |  |
Number of Apartment Units in operating Property Disposed |  |  |  | 1,116 |  |  |  |  |  |  |  |
Proceeds from sale of operating properties |  |  |  | $ 114,400 |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  | $ 85,100 |  |  |  |  |  |  |  |

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- Definition Number of apartment units in property disposed of or held for sale during the period. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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