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Segment Disclosures - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) facility | Dec. 31, 2017 USD ($) facility | Dec. 31, 2016 USD ($) facility
Segment Reporting Information [Line Items] |  |  |
Impairment related to goodwill |  | $ 0 | $ 0
Goodwill | $ 47,000,000 | $ 47,000,000 |
Senior housing triple-net |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of SH NNN facilities transitioned to RIDEA structure (in facilities) | facility | 22 | 25 | 17
Operating segment | Senior housing triple-net |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 21,000,000 | $ 21,000,000 |
Operating segment | SHOP |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 9,000,000 | 9,000,000 |
Operating segment | Medical office |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 11,000,000 | 11,000,000 |
Operating segment | Other non-reportable segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 6,000,000 | $ 6,000,000 |

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