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Real Estate Properties - Acquisitions (Details) $ in Thousands | 1 Months Ended | 9 Months Ended
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Jun. 30, 2018 USD ($) living_unit community property | Feb. 28, 2018 USD ($) living_unit | Feb. 28, 2018 USD ($) | Feb. 28, 2018 USD ($) community | Feb. 28, 2018 USD ($) property | Jan. 31, 2018 USD ($) living_unit | Jan. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) community | Jan. 31, 2018 USD ($) property | Nov. 30, 2017 property | Sep. 30, 2018 USD ($) living_unit property | Sep. 30, 2017 USD ($)
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Assumed Debt |  |  |  |  |  |  |  |  |  |  | $ 44,386 | $ 0
Five Star | Acquisition | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | 2 |  |  |  |  |  |  |  |  | 6 | 4 |
Units | living_unit |  |  |  |  |  |  |  |  |  |  | 366 |
Cash Paid Plus Assumed Debt |  |  |  |  |  |  |  |  |  |  | $ 66,350 |
Acquired Real Estate Intangible Assets |  |  |  |  |  |  |  |  |  |  | 11,489 |
Assumed Debt | $ 16,588 |  |  |  |  |  |  |  |  |  | 33,336 |
Premium on Assumed Debt |  |  |  |  |  |  |  |  |  |  | (1,845) |
Five Star | Acquisition | Tennessee | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | 2 |  |  |  |  |  |  | 1 | 1 |  |  |
Units | living_unit | 151 |  |  |  |  | 88 |  |  |  |  |  |
Cash Paid Plus Assumed Debt | $ 23,860 |  |  |  |  |  | $ 19,868 |  |  |  |  |
Acquired Real Estate Intangible Assets |  |  |  |  |  | $ 3,195 | 3,195 | $ 3,195 | $ 3,195 |  | 3,843 |
Assumed Debt | 16,588 |  |  |  |  |  | 0 |  |  |  |  |
Premium on Assumed Debt | (486) |  |  |  |  |  | 0 |  |  |  |  |
Five Star | Acquisition | Arizona | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties |  |  |  | 1 | 1 |  |  |  |  |  |  |
Units | living_unit |  | 127 |  |  |  |  |  |  |  |  |  |
Cash Paid Plus Assumed Debt |  |  | $ 22,622 |  |  |  |  |  |  |  |  |
Acquired Real Estate Intangible Assets |  | $ 4,451 | 4,451 | $ 4,451 | $ 4,451 |  |  |  |  |  |  |
Assumed Debt |  |  | 16,748 |  |  |  |  |  |  |  |  |
Premium on Assumed Debt |  |  | (1,359) |  |  |  |  |  |  |  |  |
Five Star | Acquisition | Land | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment |  |  |  |  |  |  |  |  |  |  | 3,562 |
Five Star | Acquisition | Land | Tennessee | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment | 965 |  |  |  |  |  | 580 |  |  |  |  |
Five Star | Acquisition | Land | Arizona | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment |  |  | 2,017 |  |  |  |  |  |  |  |  |
Five Star | Acquisition | Building and Improvements | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment |  |  |  |  |  |  |  |  |  |  | 49,917 |
Five Star | Acquisition | Building and Improvements | Tennessee | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment | 17,910 |  |  |  |  |  | 14,884 |  |  |  |  |
Five Star | Acquisition | Building and Improvements | Arizona | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment |  |  | 17,123 |  |  |  |  |  |  |  |  |
Five Star | Acquisition | FF&E | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment |  |  |  |  |  |  |  |  |  |  | $ 3,227 |
Five Star | Acquisition | FF&E | Tennessee | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment | $ 1,628 |  |  |  |  |  | $ 1,209 |  |  |  |  |
Five Star | Acquisition | FF&E | Arizona | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties acquired, property plant and equipment |  |  | $ 390 |  |  |  |  |  |  |  |  |

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