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Concentration of Credit Risk - Narrative (Details) - Brookdale Senior Living | 12 Months Ended
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Dec. 31, 2018 facility renewal | Dec. 31, 2017
SHOP | Management and Accounting Services |  |
Concentration Risk [Line Items] |  |
Management agreement renewal term (in years) | 5 years |
SHOP | Percentage of Total Company Assets |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 7.00% | 13.00%
Management and Accounting Services | SHOP |  |
Concentration Risk [Line Items] |  |
Number of investments in senior housing facility joint ventures (in joint ventures) | facility | 35 |
Number of unconsolidated joint ventures (in joint ventures) | facility | 16 |
Minimum |  |
Concentration Risk [Line Items] |  |
Percentage of EDITDAR payable as base management fee | 4.50% |
Minimum | SHOP | Management and Accounting Services |  |
Concentration Risk [Line Items] |  |
Management agreement term (in years) | 10 years |
Management agreement number of renewals (in renewals) | renewal | 3 |
Maximum |  |
Concentration Risk [Line Items] |  |
Percentage of EDITDAR payable as base management fee | 5.00% |
Maximum | SHOP | Management and Accounting Services |  |
Concentration Risk [Line Items] |  |
Management agreement term (in years) | 15 years |
Management agreement number of renewals (in renewals) | renewal | 4 |

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- Definition Represents the term of renewals of the agreement under which the Company receives management and accounting services. + References No definition available. + Details
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