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Fair Value Measurements - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) community | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Marketable securities |  |  |  |  | $ 49,790 | $ 14,855
Debt |  |  |  |  | 3,572,221 | $ 3,640,180
Property, plant and equipment and leasehold intangibles, net |  | $ 2,500 |  | $ 50,200 |  |
ASU 2016-02 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset, number of communities impaired | community | 25 |  |  |  |  |
Operating lease right-of-use assets | $ 56,600 |  |  |  |  |
Cumulative effect change in accounting principle | $ 58,100 |  |  |  |  |
Assisted Living and Memory Care |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  | $ 351,700 |  |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Marketable securities |  |  |  |  | $ 49,800 |

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