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Acquisitions, Dispositions, Impairment, Assets Held for Sale, and Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2014
Significant Acquisitions and Disposals [Line Items] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | During the year ended December 31, 2014, we completed the acquisition of one operating property as follows:
($ in millions) Acquisitions of Operating Properties |  | Location |  | Number of Apartment Homes |  | Date of Acquisition |  | Purchase Price
Camden Fourth Ward |  | Atlanta, GA |  | 276 |  | 10/29/2014 |  | $62.6
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed | The following table summarizes the fair values of the assets acquired and liabilities assumed for the acquisition of the operating properties described above as of the respective acquisition dates:
(in millions) |  | 2014 |  | 2013
Assets acquired: |  |  |
| Buildings and improvements | $ | 51.3 |  |  | $ | 192.0 |
| Land | 10.5 |  |  | 29.5 |
| Intangible and other assets | 0.9 |  |  | 4.5 |
Total assets acquired | $ | 62.7 |  |  | $ | 226.0 |
Liabilities assumed: |  |  |
| Other liabilities | $ | 0.4 |  |  | $ | 1.9 |
Total liabilities assumed | $ | 0.4 |  |  | $ | 1.9 |
| Net assets acquired | $ | 62.3 |  |  | $ | 224.1 |
Summary of income from discontinued operations | The following is a summary of income from discontinued operations for the years presented below:
|  | Year Ended December 31,
(in thousands) |  | 2013 |  | 2012
Property revenues |  | $ | 24,322 |  |  | $ | 60,198 |
Property expenses |  | (10,552 | ) |  | (27,557 | )
|  | $ | 13,770 |  |  | $ | 32,641 |
Interest |  | — |  |  | (36 | )
Depreciation and amortization |  | (5,255 | ) |  | (15,199 | )
Income from discontinued operations |  | $ | 8,515 |  |  | $ | 17,406 |
Gain on sale of discontinued operations, net of tax |  | $ | 182,160 |  |  | $ | 115,068 |
Less income, including gain on sale, allocated to non-controlling interests from discontinued operations |  | (5,905 | ) |  | (3,200 | )
Income from discontinued operations, including gain on sale, attributable to common shareholders |  | $ | 184,770 |  |  | $ | 129,274 |

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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1486-128463 + Details
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- Definition Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&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 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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