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Summary of Significant Accounting Policies - Leasing Costs and Revenue Recognition (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
community
Dec. 31, 2016
USD ($)
community
Dec. 31, 2015
USD ($)
community
DEFERRED LEASING COSTS      
Unamortized gross balance of deferred leasing costs $ 31,081 $ 24,825  
Accumulated amortization 8,769 6,898  
Deferred costs, leases under negotiation $ 98    
Weighted average amortization period for deferred leasing cost 7 years 10 months    
Expected amortization expense for the five years      
Expected amortization expense, 2018 $ 4,297    
Expected amortization expense, 2019 3,699    
Expected amortization expense, 2020 3,198    
Expected amortization expense, 2021 2,604    
Expected amortization expense, 2022 2,052    
Expected amortization expense, thereafter 6,462    
Percentage rents earned $ 10,168 $ 10,169 $ 10,062
Senior Living Communities | Five Star      
Expected amortization expense for the five years      
Number of communities managed | community 70 68 60
Private senior living manager      
Expected amortization expense for the five years      
Number of properties acquired, referred to as managed properties | community 5