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Real Estate Properties - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 06, 2019 USD ($) property | Nov. 06, 2019 USD ($) property | Sep. 30, 2019 USD ($) state building property | Aug. 31, 2019 USD ($) building | Jul. 31, 2019 USD ($) building | Jun. 30, 2019 USD ($) building property | Mar. 31, 2019 USD ($) building | Sep. 30, 2019 USD ($) state building property | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) state building property | Sep. 30, 2018 USD ($)
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Impairment of assets | $ |  |  |  |  |  |  |  | $ 33,099 | $ 4,525 | $ 41,518 | $ 5,073
MOBs |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  | 7 |  |  |  |  | 7 |  | 7 |
Number of real estate properties held for sale |  |  | 4 |  |  |  |  | 4 |  | 4 |
Impairment of assets | $ |  |  |  |  |  |  |  | $ 26,037 |  | $ 26,133 |
Number of real estate properties sold |  |  |  |  |  | 4 |  |  |  |  |
Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  | 16 |  |  |  |  | 16 |  | 16 |
Number of real estate properties held for sale |  |  | 4 |  |  |  |  | 4 |  | 4 |
Impairment of assets | $ |  |  |  |  |  |  |  | $ 7,062 |  | $ 15,385 |
SNF |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold |  |  | 15 |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  | 436 |  |  |  |  | 436 |  | 436 |
Number of real estate properties held for sale |  |  | 8 |  |  |  |  | 8 |  | 8 |
Number of states in which properties are located | state |  |  | 41 |  |  |  |  | 41 |  | 41 |
Amount under agreement to sell | $ |  |  | $ 136,231 |  |  |  |  | $ 136,231 |  | $ 136,231 |
Disposal Group, Held-for-sale, Not Discontinued Operations | MOBs |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale |  |  | 2 |  |  | 3 |  | 2 |  | 2 |
Impairment of assets | $ |  |  |  |  |  |  |  |  |  | $ 2,661 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | building |  |  |  |  |  |  |  |  |  | 33 |
Aggregate sale price | $ |  |  |  |  |  |  |  |  |  | $ 53,033 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | SNF |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold |  |  |  |  |  |  |  |  |  | 18 |
Aggregate sale price | $ |  |  |  |  |  |  |  |  |  | $ 29,500 |
Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of buildings | building |  |  | 2 |  |  |  |  | 2 |  | 2 |
Senior Housing Properties | MOBs |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of properties included in joint venture |  |  | 1 |  |  |  |  | 1 |  | 1 |
Joint Venture |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 55.00% |  |  |  |  | 55.00% |  | 55.00% |
Massachusetts | Disposal Group, Disposed of by Sale, Not Discontinued Operations | MOBs |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | building |  |  | 1 | 1 | 3 | 7 | 1 |  |  |  |
Aggregate sale price | $ |  |  | $ 2,750 | $ 2,221 | $ 4,955 | $ 8,042 | $ 75 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price | $ | $ 452,804 |  |  |  |  |  |  |  |  |  |
Amount under agreement to sell | 40 | 40 |  |  |  |  |  |  |  |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold |  | 4 |  |  |  |  |  |  |  |  |
Aggregate sale price | $ |  | $ 58,000 |  |  |  |  |  |  |  |  |
Fair Value, Measurements, Nonrecurring | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  | 1 |  |  |  |  | 1 |  | 1 |
Impairment of assets | $ |  |  |  |  |  |  |  |  |  | $ 6,344 |
Fair Value, Measurements, Nonrecurring | Disposal Group, Held-for-sale, Not Discontinued Operations | MOBs |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale |  |  | 3 |  |  |  |  | 3 |  | 3 |
Impairment of assets | $ |  |  |  |  |  |  |  |  |  | $ 26,037 |

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