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Acquisitions, Dispositions and Other Significant Transactions - Blackstone Disposition (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) community | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on sale of assets, net | $ 9,833 | $ (233) | $ 76,586 | $ (1,383)
Joint Venture | Blackstone Venture |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Equity interest sold | 15.00% |  | 15.00% |
Payment to complete sale of joint venture interest | $ 2,000 |  |  |
Gain (loss) on sale of assets, net | $ 3,800 |  | $ 3,800 |
2 Leased Communities Owned By Joint Venture Terminated | Blackstone Venture |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of communities disposed of | community | 2 |  |  |

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