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Fair Value Measurements - Additional Information (Details) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 USD ($) community | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities |  | $ 83,517 |  | $ 14,855
Debt |  | 3,642,997 |  | 3,640,180
Property, plant and equipment and leasehold intangibles, net |  |  | $ 40,800 |
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 |  |  |
Reported Value Measurement |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt |  | 3,600,000 |  | $ 3,600,000
Assisted Living |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill impairment |  |  | 351,700 |
Interest Income |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gains related to trading securities |  | 300 | $ 600 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities |  | $ 83,500 |  |

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