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Investment in Real Estate Investment in Real Estate - Summary of Purchase Price Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Real Estate [Line Items]    
Land $ 916,235 $ 909,318
Buildings and Improvements 2,714,983 $ 2,704,850
Acquisition Activity    
Real Estate [Line Items]    
Land 8,388  
Buildings and Improvements 9,880  
Purchase price of industrial properties acquired $ 18,268