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CONCENTRATION OF CREDIT RISK - Triple-Net Leased Properties (Details) - Customer Concentration Risk | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Revenues | Brookdale Senior Living |  |
Concentration Risk |  |
Concentration percentage | 4.00% | 4.60%
Revenues | Ardent |  |
Concentration Risk |  |
Concentration percentage | 3.30% | 3.00%
Revenues | Kindred |  |
Concentration Risk |  |
Concentration percentage | 3.60% | 3.30%
NOI | Brookdale Senior Living |  |
Concentration Risk |  |
Concentration percentage | 8.80% | 8.60%
NOI | Ardent |  |
Concentration Risk |  |
Concentration percentage | 7.20% | 5.70%
NOI | Kindred |  |
Concentration Risk |  |
Concentration percentage | 7.80% | 6.20%

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