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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Narrative) (Details) $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 24, 2018 USD ($) a | Apr. 12, 2018 USD ($) a | Feb. 15, 2018 USD ($) | Jan. 11, 2018 USD ($) | Apr. 28, 2017 USD ($) a | Apr. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) a | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) a | Jun. 01, 2017 | Apr. 26, 2016 a
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating and maintenance |  |  |  |  |  |  |  | $ 220,732 | $ 217,817 | $ 206,780 |  |  |
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions |  |  |  |  |  |  |  | $ 7,836 | 6,822 | $ 7,125 | [1],[2] |  |
Number of Operating properties Acquired |  |  |  |  |  |  |  | 3 |  |  |  |  |
Area of Land | a |  | 1.8 |  |  | 8.2 |  |  |  |  | 4.6 |  |  |
Purchase price of land acquired |  | $ 11,400 |  |  | $ 20,000 |  |  |  |  | $ 19,900 |  |  |
Gain on sale of operating properties, including land |  |  |  |  |  |  |  | $ 0 | 43,231 | 295,397 |  |  |
Number of Units in Real Estate Property |  | 360 |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  |  | 290,005 | 58,267 | 0 |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  | 14,668 | 0 | 0 |  |  |
Gain on sale of discontinued operations, net of tax |  |  |  |  |  |  |  | 0 | 0 | $ 375,237 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a | 14.1 |  |  |  |  |  | 6.3 |  |  |  |  |  |
Proceeds from Sale of Land Held-for-investment | $ 11,500 |  |  |  |  |  | $ 2,200 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  |  |  |  |  |  |  | $ 400 |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  |  | 1 | 6 |  |  |
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  | 1,005 | 3,184 |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 78,400 | $ 523,400 |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  | $ 294,900 |  |  |
Weighted average age of operating properties |  |  |  |  |  |  |  |  |  | 24 |  |  |
Dual-Phase Property Sale [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  |  |  | 1 |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  |  |  |  |  |  |  |  | 19.6
Number of Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  | 15
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  | 4,918
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  | $ 630,000 |  |  |  |  |  |  |
Weighted average age of operating properties |  |  |  |  |  |  |  |  |  |  |  |  | 23
Hurricane [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions |  |  |  |  |  |  |  | $ 400 |  |  |  |  |
Camden North Quarter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  |  | 1 |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  |  | 333 |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate |  |  | $ 81,400 |  |  |  |  |  |  |  |  |  |
Camden Thornton Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | 299 |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate | $ 89,800 |  |  |  |  |  |  |  |  |  |  |  |
Camden Pier District [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  |  |  | 358 |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate |  |  |  | $ 126,900 |  |  |  |  |  |  |  |  |
Camden Buckhead Square [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating properties Acquired |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  |  |  |  | 250 |
[1] | Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds
[2] | Equity in income for the years ended December 31, 2017 includes our ownership interest of the hurricane related recoveries and expenses of approximately $0.4 million, respectively.

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