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Real Estate Properties - Impairment and Dispositions - (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) living_unit property | Dec. 31, 2016 USD ($) property | Sep. 30, 2016 USD ($) | Jul. 31, 2016 USD ($) building property | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) living_unit | Aug. 31, 2015 USD ($) living_unit | Jul. 31, 2015 USD ($) living_unit | Apr. 30, 2015 USD ($) building property | Feb. 28, 2015 USD ($) living_unit | Mar. 31, 2018 USD ($) community | Mar. 31, 2016 community | Sep. 30, 2015 community | Dec. 31, 2017 USD ($) living_unit community property | Dec. 31, 2016 USD ($) living_unit property | Dec. 31, 2016 USD ($) building property | Dec. 31, 2016 USD ($) property | Dec. 31, 2016 USD ($) community property | Dec. 31, 2016 USD ($) property operator | Dec. 31, 2015 USD ($) living_unit community | Dec. 31, 2015 building
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,082 |  |  | $ 18,674 |  |  | $ 194 |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 305 |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,055 |  |  | 4,061 |  |  | 0 |
Increase (decrease) in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,870 |  |  | $ 2,393 |  |  |  |
Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 796 |
Discontinued operations, held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale | property | 4 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 0 | 0 | 0 | 0 | 0 |  |
Number of units | living_unit | 1,295 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,295 |  |  |  |  |  |  |
Real estate held for sale | $ 53,338 | $ 55,681 |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,338 | $ 55,681 | $ 55,681 | $ 55,681 | $ 55,681 | $ 55,681 |  |
Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |
Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 11,488 |  |  |  |
Number of communities sold | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Number of properties sold | property | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold | $ 55,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties | 45,901 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Triple Net Leased Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,391 |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Number of Tenants | operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Triple Net Leased Senior Living Communities | Discontinued operations, held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
MOBs | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 5 |  |  |  |  |
Number of real estate properties held for sale |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 4
Number of properties sold | property |  |  |  | 4 |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  | $ 20,150 |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings sold | building |  |  |  | 4 |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Land Parcel | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land Parcel | Eminent domain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties | $ 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Skilled Nursing Facility | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  | $ 248 |  | $ 9,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  | $ 4,061 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | MOBs | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  | $ 2,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Florida | MOBs | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  | $ 2,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  |  |  |  |  |  |  |  |  | $ 39 |  |  |  | $ 3,193 |  |  | $ 1,719 |  |  | $ 1,734 |
Five Star | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  |  |  |  |  | $ (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units within a community sold | living_unit |  |  |  |  |  |  | 117 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Pennsylvania | Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  |  |  |  |  |  |  |  |  | $ (23) |  |  |  |  |  |  |  |  |  |  |
Number of units within a community sold | living_unit |  |  |  |  |  |  |  |  |  |  | 120 |  |  |  |  |  |  |  |  |  |  |
Five Star | Florida | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Iowa | Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  | $ 155 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  |  |  |  |  |  |  | $ (16) |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units within a community sold | living_unit |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Wisconsin | Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  | $ 850 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual lease rent payable |  |  |  |  |  |  |  | $ (85) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units within a community sold | living_unit |  |  |  |  |  |  |  | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast | Senior Living Communities | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | community |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  |  |  |  | $ 313,000 |  |  |  |  |  |  |  |  |  |

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- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
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- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
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