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Related Party Revenue Other Related Party (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Investment in affiliates $ 902,000 $ 0
Related party receivables 6,102,000 $ 0
REIT II    
Related Party Transaction [Line Items]    
Investment in affiliates 202,000  
REIT III    
Related Party Transaction [Line Items]    
Investment in affiliates 700,000  
Related party receivables 4,551,000  
Organization and offering costs charged by Advisor and Sub-advisor 2,000,000  
Organization and offering costs receivable acquired in a business combination 3,900,000  
REIT II and Other Related Parties    
Related Party Transaction [Line Items]    
Related party receivables $ 1,551,000