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Subsequent Events (Details)
3 Months Ended 6 Months Ended
Aug. 01, 2017
$ / shares
Jul. 21, 2017
USD ($)
ft²
property
Jul. 19, 2017
$ / shares
shares
Jul. 14, 2017
USD ($)
Jul. 07, 2017
USD ($)
ft²
property
Jul. 06, 2017
USD ($)
ft²
property
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
ft²
property
$ / shares
shares
Mar. 31, 2017
$ / shares
Jun. 30, 2017
USD ($)
ft²
property
shares
Dec. 31, 2016
USD ($)
Subsequent Event [Line Items]                      
Senior Notes               $ 148,629,000   $ 148,629,000 $ 148,594,000
Number of buildings | property               178   178  
Area of real estate property | ft²               12,700,000   12,700,000  
Net book value               $ 1,345,606,000   $ 1,345,606,000 $ 1,233,681,000
Subsequent Event [Member]                      
Subsequent Event [Line Items]                      
Senior Notes       $ 100,000,000              
Debt Instrument Term       7 years              
Dividends Payable, Date Declared Aug. 01, 2017                    
Common Stock, Dividends, Per Share, Declared | $ / shares $ 0.22                    
Dividends Payable, Date to be Paid Oct. 20, 2017                    
Dividends Payable, Date of Record Oct. 06, 2017                    
Subsequent Event [Member] | Industrial Building In Compton, CA [Member]                      
Subsequent Event [Line Items]                      
Number of buildings | property   1                  
Area of real estate property | ft²   58,000                  
Purchase price   $ 9,400,000                  
Common Stock [Member]                      
Subsequent Event [Line Items]                      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares               2,000,000   2,000,000  
Dividends Payable, Date Declared               May 02, 2017 Feb. 07, 2017    
Common Stock, Dividends, Per Share, Declared | $ / shares               $ 0.200000 $ 0.200000    
Dividends Payable, Date to be Paid               Jul. 21, 2017 Apr. 12, 2017    
Dividends Payable, Date of Record               Jul. 07, 2017 Mar. 28, 2017    
Preferred Stock [Member]                      
Subsequent Event [Line Items]                      
Dividends Payable, Date Declared               May 02, 2017 Feb. 07, 2017    
Preferred Stock, Dividends Per Share, Declared | $ / shares               $ 0.484375 $ 0.484375    
Dividends Payable, Date to be Paid               Jun. 30, 2017 Mar. 31, 2017    
Dividends Payable, Date of Record               Jun. 09, 2017 Mar. 10, 2017    
2024 Senior Unsecured Notes [Member] | Subsequent Event [Member]                      
Subsequent Event [Line Items]                      
Fixed annual interest rate       3.75%              
2017 Acquisition [Member] | Subsequent Event [Member] | Industrial Building In Seattle WA [Member]                      
Subsequent Event [Line Items]                      
Number of buildings | property         1            
Area of real estate property | ft²         13,000            
Purchase price         $ 4,000,000            
2017 Acquisition [Member] | Subsequent Event [Member] | Industrial Building In Santa Fe Springs, CA [Member]                      
Subsequent Event [Line Items]                      
Number of buildings | property           2          
Area of real estate property | ft²           87,000          
Purchase price           $ 14,900,000          
Series A Preferred Stock [Member]                      
Subsequent Event [Line Items]                      
Redemption date of Series A Preferred Stock                   Jul. 19, 2017  
Series A Preferred Stock [Member] | Subsequent Event [Member]                      
Subsequent Event [Line Items]                      
Number of shares redeemed | shares     1,840,000                
Redemption price of Series A Preferred Stock | $ / shares     $ 25.00                
Accrued and unpaid dividends | $ / shares     $ 0.096875                
Write-off of original issuance costs related to the redemption of the Series A Preferred Stock             $ 1,800,000