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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2019 USD ($) | Mar. 31, 2020 USD ($) renewal_option community shares | Mar. 31, 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 |  | 237,893,725 |  | 237,897,163 |  |
Gain on lease termination |  | $ 22,896 | $ 0 |  |  |
Senior Living Communities |  |  |  |  |  |
Payments to acquire assets | $ 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% |  |  |  |
Percentage of annual incentive fee |  | 15.00% |  |  |  |
Percentage of gross revenues realized at all communities |  | 1.50% |  |  |  |
Number of consecutive renewal terms of agreement | renewal_option |  | 2 |  |  |  |
Related Party Transaction, 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 |  |  | 22,579 |  |  |
Five Star |  |  |  |  |  |
Annual rent plus percentage |  | 4.00% |  |  |  |
Annual rent as a percentage |  |  | $ 538 |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |
Number of communities managed by related party | community |  | 244 | 76 |  |  |
Five Star |  |  |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares |  |  |  |  | 10,268,158 |
Five Star | Shareholders |  |  |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares |  |  |  |  | 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 |  |  | $ 39,313 |  |  |
Investment owned, percentage of total shares outstanding |  | 33.90% |  |  |  |
Property management agreement expense |  | $ 16,588 | $ 3,789 |  |  |
Five Star | Rental income | Rents from significant lessee | Investment |  |  |  |  |  |
Percentage of rental income |  |  | 14.80% |  |  |
Five Star | Rental Property Concentration | Rents from significant lessee | Investment |  |  |  |  |  |
Percentage of rental income |  |  | 26.50% |  |  |
Five Star | Rehabilitation Services |  |  |  |  |  |
Expenses from transactions with related party |  | $ 8,057 | $ 1,675 |  |  |

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