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Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2017 USD ($) a | Jun. 30, 2017 | Sep. 30, 2016 USD ($) a | Apr. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) a | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) a | Jun. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) a | Dec. 31, 2016 USD ($) | Jul. 31, 2017 | Jun. 01, 2017 | Jun. 15, 2016 a | Apr. 26, 2016 a
Number of Operating properties Acquired |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a | 8.2 |  | 2.4 |  | 2.0 |  | 2.4 |  |  | 2.4 |  |  |  | 0.2 |
Payments to Acquire Land | $ 20,000 |  | $ 15,000 |  | $ 4,100 |  | $ 800 |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  |  |  |  |  |  |  | 278 |  |  |  | 1,005 | 250 |  |
Purchase Price of Operating Properties Acquired |  |  |  |  |  |  |  |  | $ 58,267 | $ 0 |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  | $ 32,200 |  |  |  |  |  |  |
Proceeds from sales of operating properties |  |  |  |  |  |  |  | $ 39,000 |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | $ 375,237 | $ 375,200 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  | 6.3 |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property |  |  | 2,906 |  |  |  | 2,906 |  |  | 2,906 |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  | $ 262,700 |  |  |  |  |  |  |  |
Proceeds from sales of operating properties |  |  |  |  |  |  | $ 484,400 |  |  |  |  |  |  |  |
Sales price of land |  |  |  |  | $ 2,200 |  |  |  |  |  |  |  |  |  |
Gain on sale of land |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |
Number of operating properties sold |  |  | 5 |  |  |  | 5 |  |  | 5 |  |  |  |  |
Dual-Phase Property Sale [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  |  | 1 |  |  |  | 1 |  |  | 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

X
- Definition Number of operating properties acquired which are now fully consolidated during the period. + 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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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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