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Acquisitions, Dispositions and Other Transactions - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) community | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating and financing leases, number of communities | 306 |  |
Number of communities managed by third party | 80 |  |
Assets held for sale | $ | $ 37,397 |  | $ 42,671
Gain (loss) on sale of assets, net | $ | $ 372,839 | $ (702) |
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 | 15 |  |
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 | 11 |  |
Sale of 6 communities |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of communities disposed of |  |  | 6
Net cash proceeds | $ |  |  | $ 29,500
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 | $ |  |  | $ 5,100
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | 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 | 1 |  | 14
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | 1 Community |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net cash proceeds | $ | $ 5,500 |  |
Gain (loss) on sale of assets, net | $ | $ 200 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Two 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 | 2 |  |
Assets held for sale | $ | $ 37,400 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Sale of 14 Communities |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net cash proceeds | $ |  |  | $ 85,400
Gain (loss) on sale of assets, net | $ |  |  | $ 5,500
Current Property Ownership Status |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of communities owned | 355 |  |
Operating and financing leases, number of communities | 306 |  |
Communities Acquired Previously Leased Or Managed |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of communities acquired | 26 |  |
Healthpeak |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of communities acquired | 8 |  |
Purchase price | $ | $ 39,300 |  |
Healthpeak | Communities Acquired Previously Leased Or Managed |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of communities acquired | 18 |  |

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