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Organization, Basis of Presentation and Significant Accounting Policies (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) state community home ft² | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) state community home ft² | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Number of operating apartment communities | community | 272 |  | 272 |  |
Number of apartment homes included in operating apartment communities owned | home | 78,947 |  | 78,947 |  |
Number of states where operating apartment communities owned are located | state | 11 |  | 11 |  |
Number of Communities with Apartments under Reconstruction | community | 5 |  | 5 |  |
Number of Apartment Homes under Reconstruction | home | 1,818 |  | 1,818 |  |
Number of owned communities under construction | community | 20 |  | 20 |  |
Expected number of apartment homes under construction | home | 6,700 |  | 6,700 |  |
Communities under development rights | community | 31 |  | 31 |  |
Estimated number of apartment homes in communities to be developed | home | 9,994 |  | 9,994 |  |
Income Tax Expense (Benefit) | $ 11,184 | $ 29 | $ 11,178 | $ 87 |
Operating lease assets | 99,270 |  | 99,270 |  |
Operating lease obligation | $ 116,489 |  | $ 116,489 |  |
Number of Communities Sold with Deferred Tax Obligations | community |  |  | 2 |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Operating lease assets |  |  |  |  | $ 122,276
Operating lease obligation |  |  |  |  | $ 122,276
TRS Disposed Communities [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Income Tax Expense (Benefit) |  |  | $ 4,539 |  |
Development Communities [Member] | The Park Loggia [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Retail Square Feet Development | ft² | 67 |  | 67 |  |
Income Tax Expense (Benefit) |  |  | $ 6,645 |  |
Number Of Residential Units In Development | home | 172 |  | 172 |  |

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