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Indebtedness - 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 ($)
ft²
Property
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Number of industrial properties | Property 468   468    
Gross leasable area (GLA) of industrial properties | ft² 61.0   61.0    
Loss from Retirement of Debt $ 0 $ 0 $ (39) $ (1,653)  
Long-term Debt, Gross 1,308,035   1,308,035    
Unsecured Credit Facility          
Debt Instrument [Line Items]          
Unamortized Debt Issuance Costs 3,868   3,868   $ 4,781
Mortgage Loans Payable          
Debt Instrument [Line Items]          
Unamortized Debt Issuance Costs 1,417   1,417   1,806
Extinguishment of debt, amount     157,782    
Loss from Retirement of Debt     39    
Net carrying value of industrial properties collateralized by mortgage loans 460,550   460,550    
Long-term Debt, Gross $ 299,464   $ 299,464   451,602
2014 Unsecured Term Loan          
Debt Instrument [Line Items]          
Debt Instrument Interest Rate Change Due to Investment Grade Rating     10 basis point    
Interest Rate [1] 3.39%   3.39%    
Long-term Debt, Gross $ 200,000   $ 200,000   200,000
2015 Unsecured Term Loan          
Debt Instrument [Line Items]          
Debt Instrument Interest Rate Change Due to Investment Grade Rating     10 basis point    
Interest Rate [1] 2.89%   2.89%    
Long-term Debt, Gross $ 260,000   $ 260,000   260,000
Assumed Mortgage | Mortgage Loans Payable          
Debt Instrument [Line Items]          
Assumed Mortgage Loan     $ 11,654    
Number of industrial properties | Property 3   3    
Gross leasable area (GLA) of industrial properties | ft² 0.2   0.2    
Interest Rate 4.17%   4.17%    
2028 Private Placement Notes          
Debt Instrument [Line Items]          
Interest Rate 3.86%   3.86%    
Long-term Debt, Gross $ 150,000   $ 150,000   0
Effective Interest Rate 3.86%   3.86%    
2030 Private Placement Notes          
Debt Instrument [Line Items]          
Interest Rate 3.96%   3.96%    
Long-term Debt, Gross $ 150,000   $ 150,000   $ 0
Effective Interest Rate 3.96%   3.96%    
[1] The interest rate at September 30, 2018 also reflects the interest rate protection agreements we entered into to effectively convert the variable rate to a fixed rate. See Note 10.