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, 2013
Dec. 31, 2012
Dec. 31, 2011
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 192,592,000 $ 204,466,000  
Accumulated Amortization 133,334,000 128,587,000  
Net Carrying Amount 59,258,000 75,879,000  
Amortization of the intangible assets 16,200,000 21,400,000 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      
2014 12,200,000    
2015 9,900,000    
2016 8,900,000    
2017 6,700,000    
2018 4,200,000    
In-place lease value
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 125,504,000 134,964,000  
Accumulated Amortization 93,885,000 93,362,000  
Net Carrying Amount 31,619,000 41,602,000  
Weighted average amortization period of intangible assets 6 years    
Tenant relationship value
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 44,414,000 46,828,000  
Accumulated Amortization 25,962,000 23,346,000  
Net Carrying Amount 18,452,000 23,482,000  
Weighted average amortization period of intangible assets 7 years    
Below-market cost arrangements
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 12,416,000 12,416,000  
Accumulated Amortization 5,136,000 4,100,000  
Net Carrying Amount 7,280,000 8,316,000  
Weighted average amortization period of intangible assets 29 years    
Above-market leases
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 8,925,000 8,925,000  
Accumulated Amortization 7,970,000 7,432,000  
Net Carrying Amount 955,000 1,493,000  
Weighted average amortization period of intangible assets 3 years    
Market concentration premium
      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 1,333,000 1,333,000  
Accumulated Amortization 381,000 347,000  
Net Carrying Amount $ 952,000 $ 986,000  
Weighted average amortization period of intangible assets 29 years