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Acquisitions, Dispositions and Other Significant Transactions - Healthpeak CCRC Venture and Master Lease Transactions (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) entryFee community extension_option | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) entryFee community | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) entryFee | Dec. 31, 2019 USD ($) entryFee | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of additional entry fee | entryFee | 1 |  |  |  |  |  |
Gain (loss) on sale of assets, net |  |  |  |  | $ 374,532,000 | $ 7,245,000 | $ 293,246,000
Gain (loss) on debt modification and extinguishment, net |  |  |  |  | $ 10,896,000 | $ (5,247,000) | $ (11,677,000)
Number of communities previously subject to sale leaseback transactions | community |  |  | 8 |  |  |  |
CCRC Venture | CCRCs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired | 51.00% |  |  |  |  |  |
Number of entry fee | entryFee | 14 |  |  |  |  | 16 |
Purchase price | $ 289,200,000 |  |  |  |  |  |
Payments to acquire interest in joint venture | $ 1,060,000,000.00 |  |  |  |  |  |
Number of entry fee sales | entryFee | 2 |  | 2 |  | 2 |  |
Number of owned communities transferred | community | 2 |  |  |  |  |  |
HCP, Inc. | CCRCs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 289,200,000 |  |
Post closing working capital adjustment obligation |  |  |  | $ 5,900,000 |  |  |
Gain (loss) on sale of assets, net |  |  |  |  | $ 369,800,000 |  |
Payments for management agreement termination fee | $ 100,000,000.0 |  |  |  |  |  |
Master Lease Transactions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of continuing communities | community | 24 |  |  |  |  |  |
Base rent | $ 41,700,000 |  |  |  |  |  |
Annual escalator rate | 2.40% |  |  |  |  |  |
Initial lease rate | 7.00% |  |  |  |  |  |
Gain (loss) on debt modification and extinguishment, net |  |  | $ 19,700,000 |  |  |  |
Financing lease obligations, carrying value |  |  | $ 105,100,000 |  |  |  |
Master Lease Transactions | HCP, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire interest in joint venture | $ 405,500,000 |  |  |  |  |  |
Number of communities leased | community | 25 |  |  |  |  |  |
Number of communities, acquired, currently leased | community | 18 |  |  |  |  |  |
Acquisition related costs | $ 1,700,000 |  |  |  |  |  |
Number of lease communities transferred to successor operator | community | 1 |  |  |  |  |  |
Number of continuing communities | community | 24 |  |  |  |  |  |
Number of extensions | extension_option | 2 |  |  |  |  |  |
Term of number of extensions | 10 years |  |  |  |  |  |
Capital expenditures | $ 35,000,000.0 |  |  |  |  |  |
Non-Recourse First Mortgages | Master Lease Transactions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 192,600,000 | $ 30,000,000.0 |  |  |  |  |

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