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, 2012
Y
Sep. 30, 2011
Dec. 31, 2011
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 204,465,000   $ 221,168,000
Accumulated Amortization 123,406,000   132,048,000
Net Carrying Amount 81,059,000   89,120,000
Amortization of the intangible assets 16,200,000 20,700,000  
Weighted average amortization periods of intangible assets (in years) 10    
Estimated future amortization expense associated with the intangible asset categories for the next five years      
Three months ending December 31, 2012 4,300,000    
2013 14,300,000    
2014 12,300,000    
2015 10,600,000    
2016 9,500,000    
2017 7,100,000    
In-place lease value
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 134,964,000   151,361,000
Accumulated Amortization 89,808,000   97,594,000
Net Carrying Amount 45,156,000   53,767,000
Weighted average amortization periods of intangible assets (in years) 7    
Tenant relationship value
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 46,827,000   45,940,000
Accumulated Amortization 22,192,000   23,246,000
Net Carrying Amount 24,635,000   22,694,000
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   12,416,000
Accumulated Amortization 3,789,000   2,857,000
Net Carrying Amount 8,627,000   9,559,000
Weighted average amortization periods of intangible assets (in years) 27    
Above-market leases
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 8,925,000   10,118,000
Accumulated Amortization 7,278,000   8,037,000
Net Carrying Amount 1,647,000   2,081,000
Weighted average amortization periods of intangible assets (in years) 4    
Market concentration premium
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 1,333,000   1,333,000
Accumulated Amortization 339,000   314,000
Net Carrying Amount $ 994,000   $ 1,019,000
Weighted average amortization periods of intangible assets (in years) 30