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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 USD ($) | Dec. 31, 2019 USD ($) living_unit community shares | Dec. 31, 2019 USD ($) community shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) community shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) living_unit community lease_agreement renewal_option shares | Dec. 31, 2018 USD ($) community shares | Dec. 31, 2017 USD ($) community | Jan. 01, 2020 | Feb. 01, 2019 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) | shares |  | 237,897,163 | 237,897,163 |  |  |  | 237,729,900 |  |  |  | 237,897,163 | 237,729,900 |  |  |
Unsecured revolving credit facility |  | $ 537,500 | $ 537,500 |  |  |  | $ 139,000 |  |  |  | $ 537,500 | $ 139,000 |  |  |
Total revenues |  |  | $ 256,039 | $ 255,827 | $ 262,003 | $ 266,286 | $ 285,222 | $ 278,969 | $ 277,202 | $ 275,770 | $ 1,040,155 | 1,117,164 | $ 1,074,729 |  |
Subsequent Event | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.90% |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) | shares |  | 10,268,158 | 10,268,158 |  |  |  |  |  |  |  | 10,268,158 |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts of transaction |  |  |  |  |  |  |  |  |  |  | $ 75,000 |  |  |  |
Monthly minimum rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000
Management fees as a percentage of gross revenues |  | 5.00% | 5.00% |  |  |  |  |  |  |  | 5.00% |  |  |  |
Percentage of annual incentive fee |  | 15.00% | 15.00% |  |  |  |  |  |  |  | 15.00% |  |  |  |
Property management agreement, management fees |  | 1.50% | 1.50% |  |  |  |  |  |  |  | 1.50% |  |  |  |
Business and property management agreement, number of agreements | renewal_option |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Percentage target EBITDA of new management agreement not earned |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |
Percentage target EBITDA of new management agreement not earned for all communities |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Unsecured revolving credit facility |  | $ 25,000 | $ 25,000 |  |  |  |  |  |  |  | $ 25,000 |  |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  | 1,433 |  |  |
Amount of improvements to communities |  |  |  |  |  |  |  |  |  |  | 111,603 |  |  |  |
Payments to acquire property, plant, and equipment |  |  |  |  |  |  |  |  |  |  | 49,155 |  |  |  |
Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements by lessee purchased |  |  |  |  |  |  |  |  |  |  | 1,739 | 5,420 |  |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  | $ 90 | $ 383 |  |  |
Number of living units | living_unit |  |  |  |  |  |  |  |  |  |  | 31,618 |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities leased by the company | community |  | 166 | 166 |  |  |  | 184 |  |  |  | 166 | 184 | 185 |  |
Rents receivable |  | $ 1,989 | $ 1,989 |  |  |  | $ 18,697 |  |  |  | $ 1,989 | $ 18,697 | $ 18,539 |  |
Real estate improvements by lessee purchased |  |  |  |  |  |  |  |  |  |  |  | 17,956 | 39,800 |  |
Increase in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  | 1,433 | 3,193 |  |
Expenses from property management agreement transactions with related party |  |  |  |  |  |  |  |  |  |  | $ 15,327 | 14,426 | 14,080 |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities managed | community |  |  |  |  |  |  |  |  |  |  | 78 |  |  |  |
Expenses from property management agreement transactions with related party |  |  |  |  |  |  |  |  |  |  | $ 5,920 | 6,442 | 7,525 |  |
Shareholders | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) | shares |  | 16,118,849 | 16,118,849 |  |  |  |  |  |  |  | 16,118,849 |  |  |  |
Plano, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units | living_unit |  | 169 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  | $ 50,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of leases with related party | lease_agreement |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Annual rent as a percentage of gross revenues, percent |  | 4.00% | 4.00% |  |  |  |  |  |  |  | 4.00% |  |  |  |
Annual rent as a percentage of gross revenues, amount |  |  |  |  |  |  |  |  |  |  | $ 538 | $ 5,525 | $ 5,533 |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities managed | community |  |  |  |  |  |  |  |  |  |  | 78 | 76 | 70 |  |
Five Star | Lease No. 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  | 73 |  |  |  |
Five Star | Lease No. 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  | 39 |  |  |  |
Five Star | Lease No. 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |
Five Star | Lease No. 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |
Five Star | Lease No. 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire property, plant, and equipment | $ 49,155 |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | $ 571,495 | $ 629,145 | $ 604,246 |  |
Rental income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | 606,558 | 700,641 | 681,022 |  |
Rental income | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | 137,898 | 212,622 | 210,539 |  |
Rental income | SHOP | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | $ 137,898 | $ 212,622 | $ 210,539 |  |

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