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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 Amortization131,736,000 123,843,000
Net Carrying Amount97,954,000 113,735,000
Amortization of the intangible assets20,700,00018,800,000 
Weighted average amortization periods of intangible assets (in years)10  
Estimated future amortization expense associated with the intangible asset categories   
Remainder of 20115,700,000  
201218,500,000  
201314,300,000  
201412,000,000  
201510,000,000  
20168,600,000  
In-place lease value
   
Intangible assets on real estate acquisitions   
Gross Carrying Amount156,477,000 162,708,000
Accumulated Amortization97,818,000 92,380,000
Net Carrying Amount58,659,000 70,328,000
Weighted average amortization periods of intangible assets (in years)7  
Tenant relationship value
   
Intangible assets on real estate acquisitions   
Gross Carrying Amount48,556,000 50,320,000
Accumulated Amortization22,569,000 21,603,000
Net Carrying Amount25,987,000 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 Amount12,415,000 12,415,000
Accumulated Amortization2,489,000 1,387,000
Net Carrying Amount9,926,000 11,028,000
Weighted average amortization periods of intangible assets (in years)26  
Above-market leases
   
Intangible assets on real estate acquisitions   
Gross Carrying Amount10,909,000 10,802,000
Accumulated Amortization8,555,000 8,193,000
Net Carrying Amount2,354,000 2,609,000
Weighted average amortization periods of intangible assets (in years)5  
Market concentration premium
   
Intangible assets on real estate acquisitions   
Gross Carrying Amount1,333,000 1,333,000
Accumulated Amortization305,000 280,000
Net Carrying Amount$ 1,028,000 $ 1,053,000
Weighted average amortization periods of intangible assets (in years)31