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Leases and Management Agreements with Five Star (Details) - Five Star $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) living_unit community | Sep. 30, 2017 USD ($) community | Sep. 30, 2018 USD ($) living_unit community lease_agreement | Sep. 30, 2017 USD ($) community | Nov. 30, 2018 living_unit | Dec. 31, 2017 USD ($)
Number of communities leased by the Company | community | 184 | 185 | 184 | 185 |  |
Number of leases with related party | lease_agreement |  |  | 5 |  |  |
Total rental income recognized | $ 51,757 | $ 51,333 | $ 155,207 | $ 153,441 |  |
Related party transaction, annual rents due | 1,386 | 1,353 | 4,050 | 4,190 |  |
Rents receivable | $ 17,256 |  | 17,256 |  |  | $ 18,539
Real estate improvements purchased |  |  | 14,749 | 30,698 |  |
Increase or decrease in annual lease rent payable |  |  | $ 1,177 | 2,464 |  |
Number of communities owned and managed by related party | living_unit | 98 |  | 98 |  |  |
Property management agreement expense | $ 3,666 | 3,414 | $ 10,694 | $ 10,531 |  |
Rents from significant lessee | Revenues |  |  |  |  |  |
Percentage of rental income | 18.60% |  | 18.70% |  |  |
Rents from significant lessee | Investment |  |  |  |  |  |
Percentage of rental income |  |  | 27.00% |  |  |
Senior Living Communities |  |  |  |  |  |
Number of communities managed by related party | community |  |  | 75 | 68 |  |
Rehabilitation Services |  |  |  |  |  |
Expenses from transactions with related party | $ 1,584 | $ 1,841 | $ 4,944 | $ 5,709 |  |
Subsequent Event |  |  |  |  |  |
Number of communities owned and managed by related party | living_unit |  |  |  |  | 238 |

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