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Real Estate Investments, Net - Dispositions (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
property
Mar. 31, 2018
USD ($)
Dec. 31, 2018
property
Real Estate [Line Items]      
Proceeds from dispositions of real estate investments, net $ 9,277 $ 0  
Gain on dispositions of real estate investments $ 892 $ 0  
Number of real estate properties held for sale | property 3   3
Madison, Indiana      
Real Estate [Line Items]      
Proceeds from dispositions of real estate investments, net $ 9,300    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Madison, Indiana      
Real Estate [Line Items]      
Proceeds from dispositions of real estate investments, gross 9,500    
Gain on dispositions of real estate investments $ 900