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Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 29, 2016 USD ($) | Jun. 30, 2016 USD ($) a | Apr. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) a | Jun. 30, 2015 USD ($) a | May 31, 2015 USD ($) a | Mar. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) | Jun. 30, 2016 USD ($) a | Jun. 30, 2015 USD ($) a | Jun. 30, 2016 USD ($) a | Jun. 30, 2015 USD ($) a | Apr. 26, 2016 a
Area of Land | a |  | 0.2 |  | 2.0 | 2.7 | 49.6 |  |  | 0.2 | 2.7 | 0.2 | 2.7 |
Payments to Acquire Land |  | $ 800 |  | $ 4,100 | $ 9,500 | $ 36,300 |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  |  |  | $ 375,237 | $ 0 | $ 375,237 | $ 0 |
Restricted Cash and Cash Equivalents |  | $ 13,000 |  |  |  |  |  |  | $ 13,000 |  | $ 13,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  | 6.3 |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  | 278 |  |  |  |  |  | 1,116 | 278 |  | 278 |  |
Proceeds from sales of operating properties |  | $ 39,000 |  |  |  |  |  | $ 114,400 |  |  |  |  |
Sales price of land |  |  |  | $ 2,200 |  |  | $ 400 |  |  |  |  |  |
Gain on sale of land |  |  |  | $ 400 |  |  | $ 100 |  |  |  |  |  |
Number of operating properties sold |  | 1 |  |  |  |  |  | 2 | 1 |  | 1 |  |
Gain on Sale of Operating Properties |  | $ 32,200 |  |  |  |  |  | $ 85,100 |  |  |  |  |
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | 775 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of operating properties | $ 171,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold | 1 |  |  |  |  |  |  |  |  |  |  |  |
Dual-Phase Property Sale [Member] | Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold | 1 |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  |  |  |  |  |  |  |  | 19.6
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  | 4,918
Proceeds from sales of operating properties |  |  | $ 630,000 |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  |  |  |  |  |  |  | 15
Weighted average age of operating properties |  |  |  |  |  |  |  |  |  |  |  |  | 23

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- Definition Proceeds from the disposition of operating properties which was held with a qualified intermediary for use in a like-kind exchange. We included this amount in restricted cash in our consolidated balance sheets. + References No definition available. + Details
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- Definition Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 + Details
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