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Leases and Management Agreements with Five Star (Details) - Five Star $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) living_unit community | Jun. 30, 2017 USD ($) community | Jun. 30, 2018 USD ($) living_unit community lease_agreement | Jun. 30, 2017 USD ($) community | 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 | $ 51,692 | $ 51,123 | $ 103,450 | $ 102,108 |
Related party transaction, annual rents due | 1,289 | 1,392 | 2,664 | 2,837 |
Rents receivable | $ 17,198 |  | 17,198 |  | $ 18,539
Real estate improvements purchased |  |  | 8,529 | 19,308 |
Increase or decrease in annual lease rent payable |  |  | $ 680 | 1,547 |
Number of communities owned and managed by related party | living_unit | 98 |  | 98 |  |
Management fees as a percentage of gross revenues (equal to) | 5.00% |  | 5.00% |  |
Incentive fee as percentage of annual net operating income | 20.00% |  | 20.00% |  |
Annual minimum return | $ 1,000 |  | $ 1,000 |  |
Annual Return as percentage of invested capital | 7.00% |  | 7.00% |  |
Invested capital (in excess of) | $ 500 |  | $ 500 |  |
Property management agreement expense | $ 3,533 | 3,554 | $ 7,027 | $ 7,117 |
Rents from significant lessee | Revenues |  |  |  |  |
Percentage of rental income | 18.60% |  | 18.70% |  |
Rents from significant lessee | Investment |  |  |  |  |
Percentage of rental income |  |  | 26.90% |  |
Senior Living Communities |  |  |  |  |
Number of communities managed by related party | community |  |  | 75 | 68 |
Rehabilitation Services |  |  |  |  |
Expenses from transactions with related party | $ 1,660 | $ 1,886 | $ 3,359 | $ 3,868 |

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