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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) a | Mar. 31, 2015 USD ($) | Jul. 31, 2014 USD ($) a | Sep. 30, 2016 USD ($) a | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) a | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) a | Dec. 31, 2014 USD ($) a | Apr. 26, 2016 a
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures accounted for under equity method investments |  |  |  |  |  |  |  |  | 3 |  | 2 |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 31.30% |  |  | 31.30% | 20.00% |
Area of Land | a |  |  |  |  | 2.4 |  | 58.1 |  | 4.6 | 58.1 |  |
Proceeds from disposition included in restricted cash |  |  |  |  |  | $ 13,000,000 |  |  |  |  |  |
Purchase price of land acquired |  |  |  |  |  |  |  |  | $ 19,900,000 | $ 59,100,000 |  |
Impairment associated with land holdings |  |  |  |  |  |  |  |  | 0 | 0 | $ 1,152,000 |
Gain (Loss) on Sale of Properties |  |  |  |  | $ 262,719,000 | $ 32,235,000 | $ 18,870,000 | $ 85,192,000 |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  |  | 0 | 9,500,000 | 0 |
Gain on sale of discontinued operations, net of tax |  |  |  |  |  |  |  |  | 375,237,000 | 0 | $ 0 |
Corporate Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 0.01% |  |  |  |  | 0.01% |  |  |  |
Number of Businesses Acquired |  |  | 2 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  |  | 798 |  |  |  |  | 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 |  | 2.4 |  |  |  |  |  |  | 26.9 |
Proceeds from Sale of Land Held-for-investment |  | $ 2,200,000 |  | $ 800,000 |  |  |  |  |  | 1,100,000 | $ 22,900,000 |
Gains (Losses) on Sales of Investment Real Estate |  |  |  |  |  |  |  |  | $ 400,000 | $ 300,000 | $ 3,600,000 |
Number of Real Estate Properties |  |  | 2 |  | 5 | 1 | 3 | 2 | 6 | 3 | 5 |
Number of Units in Real Estate Property |  |  |  |  |  |  | 1,376 |  | 3,184 | 1,376 | 1,847 |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 523,400,000 | $ 147,400,000 | $ 218,300,000 |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  | $ 294,900,000 | $ 104,000,000 | $ 155,700,000 |
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

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