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Business Development and Other Significant Transactions (Schedule of Allocated Purchase Price) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 08, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Gain on bargain purchase   $ 925 $ 0 $ 0
Selma Nursing Centers        
Business Acquisition [Line Items]        
Purchase Price $ 8,750      
Gain on bargain purchase 925      
Assets acquired 9,675      
Building 8,435      
Land 760      
Land Improvements 145      
Furniture, Fixtures and Equipment $ 335