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Fair Value Measurements - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) community lease shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) community lease shares | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) community | Mar. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Marketable securities |  | $ 136,136 |  | $ 136,136 |  |  |  | $ 68,567
Debt |  | $ 3,930,165 |  | $ 3,930,165 |  |  |  | 3,555,123
Number of shares authorized to be purchased | shares |  | 16,300,000 |  | 16,300,000 |  |  |  |
Number of communities leased | lease |  | 236 |  | 236 |  |  |  |
Operating lease, right of use assets impairment charge |  | $ 3,300 |  | $ 75,600 |  |  |  |
Ventas, Inc | The Warrant |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to be purchased | shares | 16,300,000 |  |  |  |  |  |  |
Share price (in usd per share) | $ / shares | $ 3.00 |  |  |  |  |  |  |
Value of warrants issued | $ 22,900 |  |  |  |  |  |  |
Expected volatility rate | 65.00% |  |  |  |  |  |  |
Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Marketable securities |  | 136,100 |  | 136,100 |  |  |  |
Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Operating lease, right of use assets impairment charge |  | 3,300 | $ 0 | 75,600 | $ 0 |  |  |
Property, plant and equipment and leasehold intangibles impairment charge |  | $ 4,900 | $ 800 | $ 19,600 | $ 2,000 |  |  |
Condensed Consolidated Balance Sheet |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of communities leased | community |  | 2 |  | 2 |  | 9 | 35 |
Estimated fair value |  | $ 3,000 |  | $ 3,000 |  | $ 10,300 | $ 106,700 |
Minimum |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Discount rate |  | 11.20% |  | 11.20% |  |  |  |
Maximum |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Discount rate |  | 12.30% |  | 12.30% |  |  |  |
Long-term debt and lines of credit |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Debt |  | $ 3,900,000 |  | $ 3,900,000 |  |  |  | $ 3,600,000

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