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Concentration of Credit Risk - Schedule of Concentration Risk (Details) - property | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Total Assets | Brookdale |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (as a percent) |  |  | 11.00% |  | 17.00%
Revenue | Brookdale |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (as a percent) | 8.00% | 12.00% | 10.00% | 12.00% |
Senior housing triple-net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of properties classified as held for sale | 3 |  | 3 |  | 64
Senior housing triple-net | Total Assets | Brookdale |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (as a percent) |  |  | 42.00% |  | 69.00%
Senior housing triple-net | Revenue | Brookdale |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (as a percent) | 48.00% | 60.00% | 53.00% | 59.00% |

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