Annual report pursuant to Section 13 and 15(d)

Intangible Assets on Real Estate Acquisitions (Details)

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Intangible Assets on Real Estate Acquisitions (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 221,168,000 $ 237,578,000  
Accumulated Amortization 132,048,000 123,843,000  
Net Carrying Amount 89,120,000 113,735,000  
Amortization of the intangible assets 28,300,000 28,300,000 24,100,000
Weighted average amortization periods of intangible assets (in years) 12    
Estimated future amortization expense associated with the intangible asset categories for the next five years      
2012 18,000,000    
2013 13,800,000    
2014 11,500,000    
2015 9,500,000    
2016 8,200,000    
In-place lease value
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 151,361,000 162,708,000  
Accumulated Amortization 97,594,000 92,380,000  
Net Carrying Amount 53,767,000 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 45,940,000 50,320,000  
Accumulated Amortization 23,246,000 21,603,000  
Net Carrying Amount 22,694,000 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 12,416,000 12,415,000  
Accumulated Amortization 2,857,000 1,387,000  
Net Carrying Amount 9,559,000 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 10,118,000 10,802,000  
Accumulated Amortization 8,037,000 8,193,000  
Net Carrying Amount 2,081,000 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 314,000 280,000  
Net Carrying Amount $ 1,019,000 $ 1,053,000  
Weighted average amortization periods of intangible assets (in years) 31