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Real Estate (Details)
$ in Thousands
6 Months Ended 8 Months Ended 12 Months Ended
Jul. 06, 2017
USD ($)
ft²
Apr. 28, 2017
USD ($)
unit
Aug. 06, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Real Estate [Line Items]                
Acquisition cost capitalized           $ 200    
Proceeds from sale of real estate, net of selling costs           $ 0 $ 0 $ 12,259
Rancho Carmel Plaza                
Real Estate [Line Items]                
Consideration from sale of property     $ 12,700          
Proceeds from sale of real estate, net of selling costs     $ 12,300          
Gain on sale of property               $ 7,100
Pacific Ridge Apartments                
Real Estate [Line Items]                
Number of units in real estate property | unit   533            
Purchase price consideration   $ 232,000            
Acquisition cost capitalized         $ 100      
Gateway Marketplace                
Real Estate [Line Items]                
Purchase price consideration $ 42,000              
Acquisition cost capitalized       $ 100        
Area of real estate property | ft² 128,000