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, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 204,466,000 $ 221,168,000  
Accumulated Amortization 128,587,000 132,048,000  
Net Carrying Amount 75,879,000 89,120,000  
Amortization of the intangible assets 21,400,000 28,300,000 28,300,000
Weighted average amortization period of intangible assets 10 years    
Estimated future amortization expense associated with the intangible asset categories for the next five years      
2013 14,400,000    
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 93,362,000 97,594,000  
Net Carrying Amount 41,602,000 53,767,000  
Weighted average amortization period of intangible assets 7 years    
Tenant relationship value
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 46,828,000 45,940,000  
Accumulated Amortization 23,346,000 23,246,000  
Net Carrying Amount 23,482,000 22,694,000  
Weighted average amortization period of intangible assets 8 years    
Above-market cost arrangements
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 12,416,000 12,416,000  
Accumulated Amortization 4,100,000 2,857,000  
Net Carrying Amount 8,316,000 9,559,000  
Weighted average amortization period of intangible assets 28 years    
Above-market leases
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 8,925,000 10,118,000  
Accumulated Amortization 7,432,000 8,037,000  
Net Carrying Amount 1,493,000 2,081,000  
Weighted average amortization period of intangible assets 4 years    
Market concentration premium
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 1,333,000 1,333,000  
Accumulated Amortization 347,000 314,000  
Net Carrying Amount $ 986,000 $ 1,019,000  
Weighted average amortization period of intangible assets 30 years