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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
--- | --- | --- | ---
Jun. 30, 2018 USD ($) lease_portfolio community | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) lease community | Jun. 30, 2018 USD ($) community | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Payments for lease termination |  |  |  |  |  | $ 12,548 | $ 552 | $ 9,250
Loss on facility lease termination and modification, net |  | $ 13,197 | $ 2,337 | $ 146,467 | $ 0 | 162,001 | 14,276 | 11,113
Base rent |  |  |  |  |  | $ 303,294 | $ 339,721 | $ 373,635
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 |  |  |  |  |
Master Leases Not Renewed, Number Of Communities | community |  |  | 11 |  |  |  |  |
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 |  |  |  |  |  |  |
Loss on facility lease termination and modification, net |  |  |  |  |  | $ 22,600 |  |
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 |  |  |  |  |  |  |
Rent credit, potential future lease terminations | 6.25% |  |  |  |  |  |  |
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 |  |  | 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 |  |  | 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% |  |  |  |
Welltower RIDEA | Welltower Inc. |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment | $ 33,500 |  |  |  |  |  |  |
Gain on sale of equity method investment | $ 14,700 |  |  |  |  |  |  |

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