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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 09, 2021 USD ($) unit community | Jan. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) community property trustee shares | Mar. 31, 2020 USD ($) community | Dec. 31, 2020 shares | Dec. 31, 2019 shares
Common shares of beneficial interest, shares issued (in shares) | shares |  |  | 238,268,478 |  | 238,268,478 |
Gain on lease termination |  |  | $ 0 | $ 22,896 |  |
Number of properties (property) | property |  |  | 396 |  |  |
Rental income |  |  | $ 397 | 294 |  |
Five Star |  |  |  |  |  |
Total rental income recognized |  |  |  | 75,000 |  |
Gain on lease termination |  |  |  | $ 22,896 |  |
Five Star |  |  |  |  |  |
Payments made in exchange for customary release |  | $ 5,763 |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |
Number of properties (property) | community |  |  | 235 | 244 |  |
Number of real estate properties inadequate documentation | trustee |  |  | 1 |  |  |
Revenue reserve, management fees payable reduction |  |  | $ 115 |  |  |
Five Star | Senior Living Communities | Closed |  |  |  |  |  |
Number of properties (property) | community |  |  | 7 |  |  |
Five Star |  |  |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares |  |  |  |  |  | 10,268,158
Aggregate Shares Issued | shares |  |  |  |  | 16,118,849 |
Five Star |  |  |  |  |  |
Investment owned, percentage of total shares outstanding |  |  | 33.80% |  |  |
Property management agreement expense |  |  | $ 13,850 | $ 17,050 |  |
Related party transaction capitalized amount |  |  | 834 | 462 |  |
Five Star | Operating Expense |  |  |  |  |  |
Property management agreement expense |  |  | 13,016 | 16,588 |  |
Five Star | Senior Living Communities | Subsequent Event |  |  |  |  |  |
Number of properties (property) | community | 120 |  |  |  |  |
Number of property units (units) | unit | 18,000 |  |  |  |  |
Related party transactions, termination percentage | 10.00% |  |  |  |  |
Percentage target EBITDA of new management agreement not earned | 80.00% |  |  |  |  |
Five Star | Senior Living Communities | Subsequent Event | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations |  |  |  |  |  |
Total rental income recognized | $ 682,000 |  |  |  |  |
Number of properties (property) | community | 108 |  |  |  |  |
Number of property units (units) | unit | 7,500 |  |  |  |  |
Five Star | Senior Living Communities | Subsequent Event | Closed |  |  |  |  |  |
Number of property units (units) | unit | 1,500 |  |  |  |  |
Five Star | Rehabilitation Services |  |  |  |  |  |
Expenses from transactions with related party |  |  | $ 5,441 | $ 8,057 |  |

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