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COVID-19 Pandemic (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2020 USD ($) community | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 09, 2020 USD ($) | Aug. 31, 2020 USD ($) community | Mar. 31, 2020 USD ($) | Mar. 20, 2020 USD ($) | Mar. 19, 2020 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 29, 2019 USD ($) | May 07, 2019 USD ($) | Dec. 05, 2018 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities owned | community |  |  |  |  | 16 |  |  |  |  |  |  |  |
Initial annual minimum rent amount |  | $ 1,257,124,000 | $ 1,257,124,000 |  |  |  |  |  |  |  |  |  |
Rent reduced the next twelve months |  | 209,787,000 | 209,787,000 |  |  |  |  |  |  |  |  |  |
Payments for lease restructuring |  |  | 119,200,000 |  |  |  |  |  |  |  |  |  |
Total liquidity |  | 575,500,000 | 575,500,000 |  |  |  |  |  |  |  |  |  |
Unrestricted cash and cash equivalents |  | 380,420,000 | 380,420,000 |  |  |  |  |  |  | $ 240,227,000 |  |  |
Marketable securities |  | 172,905,000 | 172,905,000 |  |  |  |  |  |  | $ 68,567,000 |  |  |
Revenue from government grants |  |  | 5,900,000 |  |  |  |  |  |  |  |  |  |
CARES Act |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility operating expense |  |  | 125,500,000 |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  | 105,600,000 |  |  |  |  |  |  |  |  |  |
Employer portion of payroll taxes delayed |  | 72,700,000 | 72,700,000 |  |  |  |  |  |  |  |  |  |
Income recognized from Emergency Fund grant |  |  | 109,800,000 |  |  |  |  |  |  |  |  |  |
CARES Act | Accrued Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Employer portion of payroll taxes delayed |  | $ 36,300,000 | 36,300,000 |  |  |  |  |  |  |  |  |  |
CARES Act | Accelerated and Advance Payment Program |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received from Accelerated and Advance Payment Program |  |  | $ 87,500,000 |  |  |  |  |  |  |  |  |  |
Percent of Medicare advanced payment |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |
CARES Act | Accelerated and Advance Payment Program | Refundable Fees and Deferred Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received from Accelerated and Advance Payment Program |  |  | $ 44,600,000 |  |  |  |  |  |  |  |  |  |
CARES Act | Accelerated and Advance Payment Program | Other Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received from Accelerated and Advance Payment Program |  |  | $ 42,900,000 |  |  |  |  |  |  |  |  |  |
CARES Act | The Continuing Appropriations Act, 2021 and Other Extensions Act |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recoupment of accelerated/advanced payments start |  |  | 1 year |  |  |  |  |  |  |  |  |  |
CARES Act | The Continuing Appropriations Act, 2021 and Other Extensions Act | Period One |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for recoupment of accelerated/advanced payments rate |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Recoupment of accelerated/advanced payments period |  |  | 11 months |  |  |  |  |  |  |  |  |  |
CARES Act | The Continuing Appropriations Act, 2021 and Other Extensions Act | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for recoupment of accelerated/advanced payments rate |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Recoupment of accelerated/advanced payments period |  |  | 6 months |  |  |  |  |  |  |  |  |  |
Health Care Services and CCRCs | CARES Act | Phase 1 General Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash made available for Provider Relief Fund |  |  | $ 101,700,000 |  |  |  |  |  |  |  |  |  |
Nursing Facilities | CARES Act |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash made available for Provider Relief Fund |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |
Nursing Facilities, CCRCs Segments | CARES Act |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash made available for Provider Relief Fund |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |
Health Care Services | CARES Act |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash made available for Provider Relief Fund |  | $ 22,900,000 |  |  |  |  |  |  |  |  |  |  |
Health Care Services | CARES Act | Accelerated and Advance Payment Program |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received from Accelerated and Advance Payment Program |  |  | 75,200,000 |  |  |  |  |  |  |  |  |  |
Ventas, Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities leased | community | 120 |  |  |  |  |  |  |  |  |  |  |  |
Initial annual minimum rent amount | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Rent reduced the next twelve months | $ 86,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments for lease restructuring |  |  | 119,200,000 |  |  |  |  |  |  |  |  |  |
Line of Credit | Fifth Amended and Restated Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Current borrowing capacity |  | $ 22,200,000 | 22,200,000 |  |  |  |  |  |  |  |  |  |
First Mortgage Financing |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 156,500,000 | $ 191,300,000 | $ 73,100,000 |  |  |  |  |  |  |
First Mortgage Financing | Non-Recourse Supplemental Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 220,500,000 | $ 266,900,000 | $ 149,300,000 | $ 30,000,000.0 | $ 29,200,000 | $ 238,200,000 |  | $ 160,300,000 | $ 111,100,000 |
Loans Insured or Guaranteed by US Government Authorities | CARES Act | Provider Relief Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Relief received from Provider Relief Fund |  |  | $ 109,800,000 |  |  |  |  |  |  |  |  |  |

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