Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets on Real Estate Acquisitions (Details)

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Intangible Assets on Real Estate Acquisitions (Details) (USD $)
9 Months Ended
Sep. 30, 2011
sqfeet
Year
property
segment
Sep. 30, 2010
Dec. 31, 2010
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 229,690,000   $ 237,578,000
Accumulated Amortization 131,736,000   123,843,000
Net Carrying Amount 97,954,000   113,735,000
Amortization of the intangible assets 20,700,000 18,800,000  
Weighted average amortization periods of intangible assets (in years) 10    
Estimated future amortization expense associated with the intangible asset categories      
Remainder of 2011 5,700,000    
2012 18,500,000    
2013 14,300,000    
2014 12,000,000    
2015 10,000,000    
2016 8,600,000    
In-place lease value
     
Intangible assets on real estate acquisitions      
Gross Carrying Amount 156,477,000   162,708,000
Accumulated Amortization 97,818,000   92,380,000
Net Carrying Amount 58,659,000   70,328,000
Weighted average amortization periods of intangible assets (in years) 7    
Tenant relationship value
     
Intangible assets on real estate acquisitions      
Gross Carrying Amount 48,556,000   50,320,000
Accumulated Amortization 22,569,000   21,603,000
Net Carrying Amount 25,987,000   28,717,000
Weighted average amortization periods of intangible assets (in years) 8    
Above-market cost arrangements
     
Intangible assets on real estate acquisitions      
Gross Carrying Amount 12,415,000   12,415,000
Accumulated Amortization 2,489,000   1,387,000
Net Carrying Amount 9,926,000   11,028,000
Weighted average amortization periods of intangible assets (in years) 26    
Above-market leases
     
Intangible assets on real estate acquisitions      
Gross Carrying Amount 10,909,000   10,802,000
Accumulated Amortization 8,555,000   8,193,000
Net Carrying Amount 2,354,000   2,609,000
Weighted average amortization periods of intangible assets (in years) 5    
Market concentration premium
     
Intangible assets on real estate acquisitions      
Gross Carrying Amount 1,333,000   1,333,000
Accumulated Amortization 305,000   280,000
Net Carrying Amount $ 1,028,000   $ 1,053,000
Weighted average amortization periods of intangible assets (in years) 31