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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 USD ($) | Sep. 30, 2020 USD ($) property trustee building shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) building property trustee community renewal_option shares | Sep. 30, 2019 USD ($) community | Dec. 31, 2019 community shares | Jan. 01, 2020 shares | Feb. 01, 2019 USD ($)
Common shares of beneficial interest, shares issued (in shares) | shares |  | 238,268,478 |  | 238,268,478 |  | 237,897,163 |  |
Gain on lease termination |  | $ 0 | $ 0 | $ 22,896 | $ 0 |  |  |
Number of real estate properties scheduled for closure | property |  | 10 |  | 10 |  |  |  |
Rental income |  | $ 393 |  | $ 1,175 |  |  |  |
Senior Living Communities |  |  |  |  |  |  |  |
Payments to acquire assets | $ 49,155 |  |  |  | 49,155 |  |  |
Five Star |  |  |  |  |  |  |  |
Total rental income recognized |  |  |  | $ 75,000 |  |  |  |
Monthly minimum rent payable |  |  |  |  |  |  |  | $ 11,000
Management fees as percentage of gross revenues |  | 5.00% |  | 5.00% |  |  |  |
Percentage of annual incentive fee |  | 15.00% |  | 15.00% |  |  |  |
Percentage of gross revenues realized at all communities |  | 1.50% |  | 1.50% |  |  |  |
Number of consecutive renewal terms of agreement | renewal_option |  |  |  | 2 |  |  |  |
Property management agreement, renewal term |  |  |  | 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% |  |  |  |
Amount of improvements to communities |  |  |  |  | $ 97,480 |  |  |
Five Star |  |  |  |  |  |  |  |
Annual rent plus percentage |  | 4.00% |  | 4.00% |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |
Number of communities managed by related party | community |  |  |  | 239 | 77 |  |  |
Number of real estate properties inadequate documentation | trustee |  | 1 |  | 1 |  |  |  |
Revenue reserve for inadequate documentation |  |  |  | $ 4,005 |  |  |  |
Estimated penalties, compliance costs, and professional fees, net of management fees reimbursable |  | $ 2,167 |  | $ 2,167 |  |  |  |
Number of real estate properties scheduled for closure | building |  | 10 |  | 10 |  |  |  |
Five Star |  |  |  |  |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares |  |  |  |  |  | 10,268,158 | 10,268,158 |
Five Star | Shareholders |  |  |  |  |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares |  |  |  |  |  | 16,118,849 | 16,118,849 |
Five Star |  |  |  |  |  |  |  |
Number of communities leased by the company | community |  |  |  |  |  | 166 |  |
Number of communities managed by related party | community |  |  |  |  |  | 78 |  |
Total rental income recognized |  |  | 32,738 |  | $ 105,451 |  |  |
Investment owned, percentage of total shares outstanding |  | 33.90% |  | 33.90% |  |  |  |
Annual rent as a percentage |  |  |  |  | 538 |  |  |
Property management agreement expense |  | $ 15,182 | $ 3,832 | $ 47,937 | $ 11,492 |  |  |
Five Star | Rental income | Rents from significant lessee | Investment |  |  |  |  |  |  |  |
Percentage of rental income |  |  | 12.80% |  | 13.40% |  |  |
Five Star | Rental Property Concentration | Rents from significant lessee | Investment |  |  |  |  |  |  |  |
Percentage of rental income |  |  |  |  | 27.00% |  |  |
Five Star | Rehabilitation Services |  |  |  |  |  |  |  |
Expenses from transactions with related party |  | $ 5,972 | $ 1,478 | $ 19,843 | $ 4,666 |  |  |

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