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Debt - 2019 Financings (Details) |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 09, 2020 USD ($) community | Aug. 31, 2020 USD ($) community | Mar. 31, 2020 USD ($) community | Mar. 20, 2020 USD ($) community | Mar. 19, 2020 USD ($) community | Jan. 31, 2020 USD ($) community | Aug. 29, 2019 USD ($) community | May 07, 2019 USD ($) community | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on debt modification and extinguishment, net |  |  |  |  |  |  |  |  | $ 10,896,000 | $ (5,247,000) | $ (11,677,000)
Mortgage notes payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 156,500,000 | $ 191,300,000 | $ 73,100,000 |  |  |  |  |  |  |  |
Percentage bearing fixed interest |  |  |  |  |  | 70.00% | 75.00% | 60.00% |  |  |
Interest rate | 3.18% | 2.89% | 3.55% |  |  | 3.62% | 3.35% | 4.52% |  |  |
Percentage bearing variable interest |  |  |  |  |  |  | 25.00% | 40.00% |  |  |
Mortgage notes payable | Non-Recourse Supplemental Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal 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 |  |  |
Secured Debt | Non-Recourse First Mortgages |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities securing debt | community | 27 | 16 | 18 | 1 | 7 | 14 | 5 | 14 |  |  |
LIBOR | Mortgage notes payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage bearing fixed interest |  |  |  |  |  | 30.00% |  |  |  |  |
Basis spread on variable rate basis | 2.54% | 2.49% | 2.10% | 2.50% | 2.25% | 2.09% | 2.17% | 2.23% |  |  |

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