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Acquisitions, Dispositions and Other Significant Transactions - Ventas Lease Restructuring (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 26, 2020 USD ($) community extension_option $ / shares shares | Apr. 26, 2018 extension_option | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Initial annual minimum rent amount |  |  |  | $ 1,257,124,000 |  |
Repayments of lines of credit |  |  |  | $ 166,381,000 | $ 0 | $ 200,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |
Payments for lease restructuring |  |  |  | $ 119,200,000 |  |
Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of communities leased | community | 120 |  |  |  |  |
Initial annual minimum rent amount | $ 100,000,000 |  |  |  |  |
Reduction in rent amount to be paid | $ 83,000,000 |  |  |  |  |
Annual escalator rate | 3.00% |  |  |  |  |
Number of extensions | extension_option | 2 |  |  |  |  |
Term of extensions | 10 years |  |  |  |  |
Capital expenditures incurred but not yet paid | $ 37,800,000 |  |  |  |  |
Minimum tangible net worth | 600,000,000.0 |  |  |  |  |
Control fees | $ 25,000,000.0 |  |  |  |  |
Number of owned communities transferred | community | 5 |  |  |  |  |
Extinguishment of debt | $ 78,400,000 |  |  |  |  |
Cash payments to related party | 115,000,000.0 |  |  |  |  |
Deposit disbursements | 42,400,000 |  |  |  |  |
Repayments of lines of credit | 4,200,000 |  |  |  |  |
Operating lease obligations |  |  | $ 370,000,000.0 |  |  |
Assets under leases |  |  | $ 159,500,000 |  |  |
Payments for lease restructuring |  |  |  | $ 119,200,000 |  |
Community Level Basis | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Escrow amount | 1,500 |  |  |  |  |
Aggregate Community Basis | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Escrow amount | $ 3,600 |  |  |  |  |
Master Lease And Security Agreement | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of extensions | extension_option |  | 2 |  |  |  |
Period of lease |  | 24 months |  |  |  |
Duration of lease to invest or escrow |  | 36 months |  |  |  |
Disbursement Multiplier | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Annual escalator rate | 50.00% |  |  |  |  |
Multiplier Percentage | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Annual escalator rate | 4.50% |  |  |  |  |
Unsecured Debt | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Debt face amount | $ 45,000,000.0 |  |  |  |  |
Interest rate | 9.00% |  |  |  |  |
Interest rate percentage increase per anniversary | 0.50% |  |  |  |  |
The Warrant | Ventas, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares authorized to be purchased | shares | 16,300,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |
Share price (in usd per share) | $ / shares | $ 3.00 |  |  |  |  |
Shares voting percentage ownership cap | 9.60% |  |  |  |  |
Value of warrants issued | $ 22,900,000 |  |  |  |  |

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