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Fair Value Measurements - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) community lease | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) community lease | Jun. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Marketable securities | $ 109,873 |  | $ 109,873 |  |  | $ 68,567
Line of credit, borrowings outstanding | 166,381 |  | 166,381 |  |  | 0
Debt | $ 3,692,365 |  | $ 3,692,365 |  |  | 3,555,123
Number of communities leased | lease | 237 |  | 237 |  |  |
Operating lease, right of use assets impairment charge | $ 6,600 |  | $ 72,300 |  |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Marketable securities | 109,900 |  | 109,900 |  |  |
Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Operating lease, right of use assets impairment charge | 6,600 | $ 0 | 72,300 | $ 0 |  |
Property, plant and equipment and leasehold intangibles impairment charge | $ 3,700 | $ 1,200 | $ 14,700 | $ 1,200 |  |
Condensed Consolidated Balance Sheet |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Number of communities leased | community | 9 |  | 9 |  | 35 |
Estimated fair value | $ 10,300 |  | $ 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
Fifth Amended and Restated Credit Agreement | Line of Credit |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Line of credit, borrowings outstanding | $ 166,400 |  | $ 166,400 |  | $ 166,400 |

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