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Real Estate Investments, Net - Dispositions (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
property
Mar. 31, 2017
USD ($)
property
Dec. 31, 2017
property
Real Estate [Line Items]      
Number of real estate properties held for sale (property) | property 0   0
Number of properties sold (property) | property 0    
Proceeds from dispositions of real estate investments $ 0 $ 12,440  
Gain on dispositions of real estate investments $ 0 957  
Advisor      
Real Estate [Line Items]      
Gain on dispositions of real estate investments   600  
Properties Sold      
Real Estate [Line Items]      
Gain on dispositions of real estate investments   $ 400  
Kulicke & Soffa      
Real Estate [Line Items]      
Number of properties sold (property) | property   1  
Proceeds from dispositions of real estate investments   $ 13,000