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Acquisitions, Dispositions and Other Significant Transactions - Welltower Lease and RIDA Venture Restructuring (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) community | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) lease community | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) lease community
Business Acquisition [Line Items] |  |  |  |  |  |
Payments for lease termination |  |  |  |  | $ 0 | $ 12,548
Loss on facility lease termination and modification, net |  | $ 0 | $ (2,337) |  | $ (2,006) | $ (148,804)
Master leases not renewed, number of communities | community |  |  | 11 |  |  | 11
Welltower Lease Transactions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number Of Leases Not Renewed | lease |  |  | 2 |  |  | 2
Welltower Inc. | Welltower Lease Transactions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments for lease termination |  |  |  | $ 58,000 |  |
Loss on facility lease termination and modification, net |  |  |  | 22,600 |  |
Proceeds from sale of equity method investment |  |  |  | 33,500 |  |
Gain on sale of equity method investment |  |  |  | $ 14,700 |  |
Potential lease terminations, rent credit percentage | 6.25% |  |  |  |  |
Welltower Inc. | Welltower Lease Transactions | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Operating leases, rent expense | $ 5,000 |  |  |  |  |
Welltower RIDEA |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage ownership | 20.00% |  |  | 20.00% |  |
37 Communities Disposed Of Through Lease Terminations | Welltower Lease Transactions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of communities disposed of | community | 37 |  |  |  |  |

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