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Intangible Assets - Net Additional Disclosures (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operations
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 3,035 $ 4,634 $ 3,824
Finite-Lived Intangible Assets, Gross 43,924 43,162  
Assembled occupancy      
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets 734    
Finite-Lived Intangible Assets, Gross $ 2,659 1,897  
Assembled occupancy | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 4 months    
Assembled occupancy | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 8 months    
Assisted Living Facility [Member] | Favorable leases      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross   7,190  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Urgent Care Centers [Member] | Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross   $ 582  
Assisted Living Facility [Member]      
Finite-Lived Intangible Assets [Line Items]      
Number of Businesses Acquired | Operations   15