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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 ($) | Jan. 31, 2021 USD ($) | Mar. 31, 2020 community | Dec. 31, 2020 USD ($) lease_agreement trustee community option shares | Dec. 31, 2019 USD ($) community shares | Dec. 31, 2018 USD ($) community | Feb. 01, 2019 USD ($)
Concentration Risk |  |  |  |  |  |  |
Common shares, shares issued (in shares) | shares |  |  |  | 238,268,478 | 237,897,163 |  |
Gain on lease termination |  |  |  | $ 22,896 | $ 0 | $ 0 |
Due from affiliates |  |  |  | 0 | $ 1,990 |  |
Five Star |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Common shares, shares issued (in shares) | shares |  |  |  |  | 10,268,158 |  |
Aggregate shares issued (shares) | shares |  |  |  |  | 16,118,849 |  |
Five Star |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Amounts of transaction |  |  |  | 75,000 |  |  |
Gain on lease termination |  |  |  | $ 22,896 |  |  |
Monthly minimum rent payable |  |  |  |  |  |  | $ 11,000
Management fees as a percentage of gross revenues |  |  |  | 5.00% |  |  |
Percentage of annual incentive fee |  |  |  | 15.00% |  |  |
Property management agreement, management fees |  |  |  | 1.50% |  |  |
Business and property management agreement, number of agreements | option |  |  |  | 2 |  |  |
Renewal term (years) |  |  |  | 5 years |  |  |
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% |  |  |
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 |  |  |  |  |  |  |
Real estate improvements by lessee purchased |  |  |  | $ 2,138 | $ 1,739 |  |
Increase in annual lease rent payable |  |  |  | $ 135 | $ 90 |  |
Five Star |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Number of communities leased by the company | community |  |  |  |  | 166 |  |
Number of communities managed | community |  |  | 78 |  |  |  |
Amounts of transaction |  |  |  |  | $ 137,898 | 212,622 |
Consumer price index annual estimated increase |  |  |  | 2.00% |  |  |
Trigger basis for capital investment ratio (percent) |  |  |  | 6.00% |  |  |
Due from affiliates |  |  |  |  | 1,989 | 18,697 |
Real estate improvements by lessee purchased |  |  |  |  |  | 17,956 |
Increase in annual lease rent payable |  |  |  |  |  | 1,433 |
Expenses from property management agreement transactions with related party |  |  |  | $ 62,880 | 15,327 | 14,426 |
Related party transaction capitalized amount |  |  |  | 2,467 |  |  |
Lease income |  |  |  | 1,561 |  |  |
Five Star | Property Operating Expense |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Expenses from property management agreement transactions with related party |  |  |  | 60,413 |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Expenses from transactions with related party |  |  |  | $ 25,687 | 5,920 | 6,442 |
Five Star |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Number of leases with related party | lease_agreement |  |  |  | 5 |  |  |
Annual rent as a percentage of gross revenues, percent |  |  |  | 4.00% |  |  |
Annual rent as a percentage of gross revenues, amount |  |  |  |  | $ 538 | $ 5,525 |
Five Star | Subsequent Event |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Payments made in exchange for customary release |  | $ 5,763 |  |  |  |  |
Refunded management fees |  | $ 115 |  |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Number of communities managed | community |  |  |  | 235 | 78 | 76 |
Number of real estate properties inadequate documentation | trustee |  |  |  | 1 |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Payments to acquire property, plant, and equipment | $ 49,155 |  |  |  |  |  |
Residents fees and services | SHOP |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |
Revenue reserve for inadequate documentation |  |  |  | $ 3,842 |  |  |
Penalties for inadequate documentation |  |  |  | $ 1,921 |  |  |

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