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Discontinued Operations (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 | Dec. 31, 2015 Communities | Dec. 31, 2015 | Dec. 31, 2015 USD ($) | Dec. 31, 2015 Apartment_Homes | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) Communities
Gain/(loss) on sales of real estate owned, net of tax |  |  |  |  |  |  |  | $ 251,677,000 |  | $ 143,572,000 | $ 0
Document Period End Date |  |  |  |  | Dec. 31, 2015 |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  |  |  |  | 138,600,000 |  |  |
Discontinued Operations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Discontinued operations, number of communities sold | Communities |  |  |  |  |  | 1 |  |  |  |  | 2
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  |  | 0 |  | 75,000 | $ 41,919,000
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  | 408,700,000 |  | 328,400,000 | $ 81,100,000
Number of communities sold |  |  |  |  |  | 12 | 9 |  |  |  |
Number of apartment homes sold |  |  |  |  |  |  | 2,500 |  | 2,735 |  | 914
Impairment loss, net of tax |  |  |  |  |  |  |  | 0 |  | 0 | $ 1,470,000
Summary of income from discontinued operations |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  | 0 |  | 147,000 | 9,152,000
Rental expenses |  |  |  |  |  |  |  | 0 |  | 225,000 | 3,511,000
Property management fee |  |  |  |  |  |  |  | 0 |  | 4,000 | 252,000
Real estate depreciation |  |  |  |  |  |  |  | 0 |  | 0 | 1,958,000
Interest |  |  |  |  |  |  |  | 0 |  | 21,000 | (62,000)
Income before net gain on the sale of property |  |  |  |  |  |  |  | 0 |  | (103,000) | 3,493,000
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  | 0 |  | 0 | (2,355,000)
Income tax expense |  |  |  |  |  |  |  | 0 |  | 38,000 | 885,000
Income/(loss) from discontinued operations, net of tax | $ 0 | $ 79,000 | $ 18,000 | $ (87,000) |  |  |  | 0 |  | 10,000 | 43,942,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  | 0 |  | $ 10,000 | $ 42,364,000
Land |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  |  |  |  | 1,100,000 |  |  |
Operating Community [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  |  |  |  | $ 142,500,000 |  |  |
Discontinued Operations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of communities sold |  |  |  |  |  |  | 1 |  |  |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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