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Acquisitions, Dispositions and Other Significant Transactions - Welltower Lease and RIDEA Venture Restructuring (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) community lease_portfolio | Jun. 30, 2019 USD ($) community | Jun. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) lease | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) community | Dec. 31, 2019 community | Sep. 30, 2018 lease community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities leased | lease |  |  |  | 235 |  |  |  |
Payments for lease termination |  |  |  | $ 0 | $ 0 | $ 12,548 |  |
Loss on facility lease termination and modification, net |  |  |  | $ (2,303) | $ 3,388 | $ 162,001 |  |
Ownership Percentage |  |  |  | 50.00% |  |  |  |
Master leases not renewed, number of communities | community |  |  |  |  |  |  |  | 11
37 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 | community |  |  |  |  |  |  | 147 |
Welltower Lease Transactions |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of leases not renewed | lease |  |  |  |  |  |  |  | 2
Number of communities managed | community |  |  |  |  |  | 74 |  |
Welltower Lease Transactions | 37 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 | community | 37 |  |  |  |  |  |  |
Welltower Inc. | Welltower Lease Transactions |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of lease portfolios | lease_portfolio | 2 |  |  |  |  |  |  |
Payments for lease termination |  | $ 58,000 |  |  |  |  |  |
Loss on facility lease termination and modification, net |  |  |  |  |  | $ (22,600) |  |
Rent credit, potential future lease terminations | 6.25% |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  |  | $ 33,500 |  |  |  |  |
Gain on sale of equity method investment |  |  | $ 14,700 |  |  |  |  |
Welltower Inc. | Welltower Lease Transactions, Lease Portfolio Maturing In 2028 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities leased | community |  | 27 |  |  |  |  |  |
Welltower Inc. | Welltower Lease Transactions, Lease Portfolio Maturing In 2020 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities leased | community |  | 10 |  |  |  |  |  |
Maximum | Welltower Inc. | Welltower Lease Transactions |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Base rent | $ 5,000 |  |  |  |  |  |  |
Welltower RIDEA |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Ownership Percentage | 20.00% |  | 20.00% |  |  |  |  |

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