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Concentration of Credit Risk - Narrative (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 facility renewal | Dec. 31, 2017
Brookdale | Minimum |  |
Concentration Risk [Line Items] |  |
Percentage of EDITDAR payable as base management fee | 4.50% |
Brookdale | Maximum |  |
Concentration Risk [Line Items] |  |
Percentage of EDITDAR payable as base management fee | 5.00% |
SHOP | Management and Accounting Services | Brookdale |  |
Concentration Risk [Line Items] |  |
Number of facilities | facility | 43 |
Number of facilities owned by unconsolidated joint venture | facility | 16 |
Management and Accounting Services | SHOP | Brookdale |  |
Concentration Risk [Line Items] |  |
Management agreement renewal term (in years) | 5 years |
Management and Accounting Services | SHOP | Brookdale | Minimum |  |
Concentration Risk [Line Items] |  |
Management agreement term (in years) | 10 years |
Number of renewals on management agreement | renewal | 3 |
Management and Accounting Services | SHOP | Brookdale | Maximum |  |
Concentration Risk [Line Items] |  |
Management agreement term (in years) | 15 years |
Number of renewals on management agreement | renewal | 4 |
Total Assets | SHOP | Brookdale |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 7.00% | 13.00%
Brookdale | Total Assets |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 8.00% | 10.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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