Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Real Estate and Depreciation, In-place Leases (Details)

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Summary of Significant Accounting Policies - Real Estate and Depreciation, In-place Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value $ 32,093 $ 31,991  
Accumulated Amortization 22,336 19,293  
Net 9,757 12,698  
Amortization 20,636 15,360 7,643
Leases, Acquired-in-Place [Member]
     
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2013 17,382    
2014 14,837    
2015 12,228    
2016 8,984    
2017 5,548    
Tenant origination costs [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 58,444 55,640  
Accumulated Amortization 32,839 25,479  
Net 25,605 30,161  
Leasing commissions and absorbtion costs [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 90,327 86,705  
Accumulated Amortization 48,163 34,738  
Net 42,164 51,967  
Net lease intangible assets [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 14,794 14,422  
Accumulated Amortization 7,665 5,679  
Net 7,129 8,743  
Below-market ground lease [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 12,080 12,080  
Accumulated Amortization 956 766  
Net $ 11,124 $ 11,314