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Real Estate Properties - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
May 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2018
Loss Contingencies [Line Items]            
Insurance recoveries     $ 1,585 $ 0    
Brixworth | Huntsville, AL            
Loss Contingencies [Line Items]            
Reduction in carrying value   $ 741        
Insurance recoveries   $ 741        
Insurance proceeds           $ 1,560
Gain on insurance recovery     819      
Waterside | Indianapolis, IN            
Loss Contingencies [Line Items]            
Reduction in carrying value $ 267          
Insurance recoveries $ 267          
Insurance proceeds         $ 350  
Gain on insurance recovery     83      
Retreat at Cinco Ranch | Katy, TX            
Loss Contingencies [Line Items]            
Insurance proceeds     1,153      
Gain on insurance recovery     $ 683