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Acquisitions and Dispositions (Narrative) (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2021 USD ($) a | Oct. 14, 2021 USD ($) | Aug. 24, 2021 USD ($) | Jun. 29, 2021 USD ($) a | Jun. 22, 2021 USD ($) | Jun. 02, 2021 USD ($) | Jun. 01, 2021 USD ($) a | Mar. 09, 2020 USD ($) a | Jan. 13, 2020 USD ($) a | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  |  |  |  |  | $ 400 |  | $ 0 | $ 0 | $ 0 | $ 382
Total Number Of Apartment Homes In Multifamily Communities |  |  |  |  |  |  |  |  |  | 60,587 |  | 60,587 |
Purchase Price of Operating Properties Acquired |  |  |  |  |  |  |  |  |  |  |  | $ 464,000 | $ 0
Cameron Village [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  |  |  |  | 4.9 |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  |  |  | $ 18,200 |  |  |  |
Cameron Woodland Park |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  |  | 14.6 |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  | $ 9,300 |  |  |  |  |  |
Cameron Pier District II |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  | 0.2 |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  | $ 2,100 |  |  |  |  |  |  |  |  |
Cameron Franklin Park |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  |  |  |  |  | 1 |  |  |  |  |  |  |
Total Number Of Apartment Homes In Multifamily Communities |  |  |  |  |  | 328 |  |  |  |  |  |  |
Purchase Price of Operating Properties Acquired |  |  |  |  |  | $ 105,300 |  |  |  |  |  |  |
Camden Music Row |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  |  |  |  | 1 |  |  |  |  |  |  |  |
Total Number Of Apartment Homes In Multifamily Communities |  |  |  |  | 430 |  |  |  |  |  |  |  |
Purchase Price of Operating Properties Acquired |  |  |  |  | $ 186,300 |  |  |  |  |  |  |  |
Camden Central |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  |  | 1 |  |  |  |  |  |  |  |  |  |
Total Number Of Apartment Homes In Multifamily Communities |  |  | 368 |  |  |  |  |  |  |  |  |  |
Purchase Price of Operating Properties Acquired |  |  | $ 176,300 |  |  |  |  |  |  |  |  |  |
Camden Greenville | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  | 1 |  |  |  |  |  |  |  |  |  |  |
Total Number Of Apartment Homes In Multifamily Communities |  | 558 |  |  |  |  |  |  |  |  |  |  |
Purchase Price of Operating Properties Acquired |  | $ 165,500 |  |  |  |  |  |  |  |  |  |  |
Camden Baker | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a | 5.2 |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Land | $ 24,000 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  |  |  | 4.7 |  |  |  |  |
Proceeds from Sale of Land Held-for-investment |  |  |  |  |  |  |  | $ 800 |  |  |  |  |

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