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Indebtedness (Details Textual) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2010
Apr. 30, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Sep. 20, 2011
sqft
Sep. 15, 2011
Dec. 31, 2011
Mortgage Financing I - VIII [Member]
Dec. 31, 2011
Mortgage Financing X [Member]
Dec. 31, 2011
Senior unsecured notes [Member]
Dec. 31, 2010
Senior unsecured notes [Member]
Dec. 31, 2011
Unsecured Credit Facility [Member]
Dec. 31, 2010
Unsecured Credit Facility [Member]
Oct. 22, 2010
Unsecured Credit Facility [Member]
Revolving Line of Credit [Member]
Jun. 30, 2011
Unsecured Credit Facility [Member]
Term Loan [Member]
Oct. 22, 2010
Unsecured Credit Facility [Member]
Term Loan [Member]
Indebtedness (Textual) [Abstract]                                
Percentage of outstanding balance for calculating prepayment premium               1.00%                
Prohibition period for principal prepayments of mortgage financings after loan origination               12 months 3 months              
Loss on Early Retirement of Debt     $ (5,459) $ (4,304) $ 34,562         $ (2,012) $ (4,096)          
Principal amount of senior notes repurchased                   112,757 264,796          
Unamortized debt issue discount                   135 1,707          
Permanent repayment on term loan for unsecured credit facility     234,307 259,018 336,196                   100,000  
Amount of Unsecured Revolving Credit Agreement replacing Old Credit Facility     450,000                     200,000   200,000
Loss recognized on retirement of debt     147                   191      
Unamortized deferred financing cost, wrote off 1,172                              
Unsecured credit facility maturity date               Jun. 01, 2018 Oct. 01, 2021     Sep. 28, 2012        
Weighted average interest rate                       2.385%        
Increase in borrowing capacity under Unsecured Credit Facility                       500,000        
Additional Indebtedness (Textual) [Abstract]                                
Mortgage loan payable on real estate held for sale 1,008     1,008                        
Unamortized premiums 48     48                        
Carrying value of industrial properties held under mortgage and other loan     889,722                          
Letter of credit, amount     537                          
Purchase price senior unsecured notes     110,667 265,858                        
Unamortized loan commitment and origination fee and unamortized discounts or premium     717 519                        
Unamortized settlement amount of interest rate protection agreements     3,250 (183)                        
Professional service fee     0 991                        
Basis point in addition to LIBOR Interest rate under Unsecured Credit Facility     2.10%                          
Amount of exchangeable notes at maturity             128,900                  
Area of property transferred           400,000                    
Escrow balance           1,845                    
Non-recourse mortgage loan           5,040                    
Amount of secured mortgage debt, prepaid and retired 12,970 1,654                            
Prepayment fees (secured mortgage debt)   $ 17