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Investment in Real Estate - Additional Information (Details)
$ in Thousands, ft² in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
ft²
Property
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
Property
Sep. 30, 2017
USD ($)
Real Estate Properties [Line Items]        
Number of industrial properties 468   468  
Gross leasable area (GLA) of industrial properties | ft² 61.0   61.0  
Impairment of Real Estate | $ $ 0 $ 0 $ 2,756 $ 0
Acquisition Activity        
Real Estate Properties [Line Items]        
Number of industrial properties 6   6  
Gross leasable area (GLA) of industrial properties | ft² 0.5   0.5  
Held For Sale Activity        
Real Estate Properties [Line Items]        
Number of industrial properties 2   2  
Gross leasable area (GLA) of industrial properties | ft² 0.1   0.1  
Number of Land Parcels 1   1  
Disposition Activity        
Real Estate Properties [Line Items]        
Number of industrial properties 34   34  
Gross leasable area (GLA) of industrial properties | ft² 1.7   1.7  
Proceeds from sale of industrial properties | $     $ 120,516  
Gain on sale of real estate | $     $ 53,291  
Impairment Activity        
Real Estate Properties [Line Items]        
Number of industrial properties 1   1  
Number of Land Parcels 1   1  
Impairment of Real Estate | $     $ 2,756  
Disposition with Impairment Activity        
Real Estate Properties [Line Items]        
Number of industrial properties 1   1  
Number of Land Parcels 1   1