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Summary of Significant Accounting Policies - Leasing Costs and Revenue Recognition (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
community
Dec. 31, 2017
USD ($)
community
Dec. 31, 2016
USD ($)
community
DEFERRED LEASING COSTS      
Unamortized gross balance of deferred leasing costs $ 35,145 $ 31,081  
Accumulated amortization $ 11,422 8,769  
Weighted average amortization period for deferred leasing cost 7 years 6 months    
Expected amortization expense for the five years      
Expected amortization expense, 2019 $ 4,807    
Expected amortization expense, 2020 4,238    
Expected amortization expense, 2021 3,455    
Expected amortization expense, 2022 2,661    
Expected amortization expense, 2023 2,118    
Expected amortization expense, thereafter 6,444    
Percentage rents earned $ 8,443 $ 10,168 $ 10,169
Senior Living Communities | Five Star      
Expected amortization expense for the five years      
Number of communities managed | community 76 70 68