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Acquisitions, Dispositions and Other Significant Transactions - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended | 21 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) community | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) community | Sep. 30, 2019 USD ($) community | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) community | Sep. 30, 2019 USD ($) community | Sep. 30, 2019 USD ($) community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of unconsolidated joint ventures, interest sold |  |  |  |  |  |  |  | 5
Number of communities, acquired, previously leased or managed |  |  |  |  |  |  |  | 6
Operating and financing leases, number of communities | 335 |  |  | 335 |  |  | 335 | 335
Number of communities disposed through sales or termination of lease |  |  |  |  |  |  | 77 |
Gain (loss) on sale of assets, net | $ | $ 579 | $ 9,833 |  | $ 2,723 | $ 76,586 |  |  |
Assets held for sale | $ | 60,404 |  |  | $ 60,404 |  | $ 93,117 | $ 60,404 | $ 60,404
Communities Disposed Of Through Sale |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  | 30 |  |  |  |
Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  |  | 97
127 Communities Disposed Of By Sales And Lease Terminations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  |  | 127
Sale of 3 communities |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities disposed of |  |  | 3 |  |  |  |  |
Net cash proceeds | $ |  |  | $ 12,800 |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost | $ |  |  |  |  |  | $ 174,000 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  | 22 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Eight Communities |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  | 8 |  |  |  |
Net cash proceeds | $ |  |  |  | $ 44,100 |  |  |  |
Gain (loss) on sale of assets, net | $ |  |  |  | $ 900 |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Six Communities Held For Sale |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities classified as held for sale |  |  |  | 6 |  |  |  |
Assets held for sale | $ | 60,400 |  |  | $ 60,400 |  |  | 60,400 | $ 60,400
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Sale Of 22 Communities |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net cash proceeds | $ |  |  |  |  |  | $ 380,700 |  |
Gain (loss) on sale of assets, net | $ |  |  | $ 1,900 |  |  | 188,600 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Mortgage notes payable |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Mortgage debt | $ | 30,800 |  |  | 30,800 |  | $ 31,200 | 30,800 | 30,800
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Mortgage notes payable | Six Communities Held For Sale |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Mortgage debt | $ | $ 30,800 |  |  | $ 30,800 |  |  | $ 30,800 | $ 30,800
Current Property Ownership Status |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities owned | 336 |  |  | 336 |  |  | 336 | 336
Operating and financing leases, number of communities | 335 |  |  | 335 |  |  | 335 | 335
Number of communities managed |  |  |  | 17 |  |  |  |
Number of communities managed by third party | 106 |  |  | 106 |  |  | 106 | 106

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