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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Narrative) (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2018 USD ($) | Apr. 28, 2017 USD ($) a | Jan. 31, 2018 USD ($) | Apr. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) a | Mar. 31, 2015 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Jan. 11, 2018 | Jun. 01, 2017 | Apr. 26, 2016 a
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating and maintenance |  |  |  |  |  |  |  |  |  | $ 217,817,000 |  | $ 206,780,000 | $ 202,105,000 |  |  |
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions | [1] |  |  |  |  |  |  |  |  | $ 6,822,000 | [2] | $ 7,125,000 | $ 6,168,000 |  |  |
Number of Operating properties Acquired |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of joint ventures accounted for under equity method investments |  |  |  |  |  |  |  |  |  | 3 |  | 3 | 3 |  |  |
Area of Land | a |  |  | 8.2 |  |  |  |  |  |  |  |  | 4.6 |  |  |  |
Purchase price of land acquired |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  | $ 19,900,000 |  |  |  |
Gain on sale of operating properties, including land |  |  |  |  |  |  |  |  |  | $ 43,231,000 |  | 295,397,000 | $ 104,288,000 |  |  |
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 |
Payments to Acquire Real Estate |  |  |  |  |  |  |  |  |  | 58,267,000 |  | 0 | 0 |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  | $ 262,719,000 | $ 32,235,000 |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 | 9,500,000 |  |  |
Current Fiscal Year End Date |  |  |  |  |  |  |  |  |  | --12-31 |  |  |  |  |  |
Gain on sale of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | $ 0 |  | 375,237,000 | 0 |  |  |
Corporate Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 0.01% |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  |  |  |  |  |  | 798 |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  | $ 9,500,000 |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  | 6.3 |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Land Held-for-investment |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  | 1,100,000 |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 300,000 |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  | 5 | 1 | 1 |  | 6 | 3 |  |  |
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  |  | 1,005 |  | 3,184 | 1,376 |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  | $ 78,400,000 |  | $ 523,400,000 | $ 147,400,000 |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  | $ 294,900,000 | $ 104,000,000 |  |  |
Weighted average age of operating properties |  |  |  |  |  |  |  |  |  |  |  | 24 |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
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 |  |  |  | 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 |  |  |  |  | $ 630,000,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average age of operating properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23
Subsequent Event [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 |  |  |  | $ 126,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [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 |  | $ 81,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |
[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 year ended December 31, 2017 includes our ownership interest of the hurricane related expenses of approximately $0.4 million.

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