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Investments in Unconsolidated Joint Ventures (Liberty Venture I, LP) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
bldg
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg 60    
Gross proceeds $ 849,528 $ 379,139 $ 1,192,918
Management fee income $ 73,224 82,673 12,941
New Jersey | Liberty Venture I, LP      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 25.00%    
Leaseable square feet (in sqft) | ft² 4,800    
Construction in Progress | New Jersey | Liberty Venture I, LP      
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg 1    
Leaseable square feet (in sqft) | ft² 302    
Total anticipated development cost $ 21,000    
Industrial Property | Building and Building Improvements | New Jersey | Liberty Venture I, LP      
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg 29    
Equity Method Investee | Liberty Venture I, LP | New Jersey      
Schedule of Equity Method Investments [Line Items]      
Management fee income $ 1,300 1,600 $ 2,300
Prepaid Expenses and Other Current Assets | Equity Method Investee | Liberty Venture I, LP | New Jersey      
Schedule of Equity Method Investments [Line Items]      
Due from related parties $ 1 $ 223