Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets (Details 5)

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Real Estate and Intangible Assets (Details 5)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Weighted average amortization period for the intangible assets acquired and liabilities assumed    
Period for intangible assets and liabilities 12 years 1 month 6 days 17 years 1 month 6 days
In-place leases [Member]
    
Weighted average amortization period for the intangible assets acquired and liabilities assumed    
Period for intangible assets and liabilities 11 years 2 months 12 days 16 years 4 months 24 days
Leasing costs [Member]
    
Weighted average amortization period for the intangible assets acquired and liabilities assumed    
Period for intangible assets and liabilities 11 years 2 months 12 days 16 years 4 months 24 days
Customer relationships [Member]
    
Weighted average amortization period for the intangible assets acquired and liabilities assumed    
Period for intangible assets and liabilities 14 years 7 months 6 days 19 years 2 months 12 days
Above market leases [Member]
    
Weighted average amortization period for the intangible assets acquired and liabilities assumed    
Period for intangible assets and liabilities 10 years 1 month 6 days 8 years 9 months 18 days
Below market leases [Member]
    
Weighted average amortization period for the intangible assets acquired and liabilities assumed    
Period for intangible assets and liabilities 11 years 3 months 18 days 20 years 10 months 24 days