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Intangibles (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Intangible assets and liabilities      
Gross intangible lease assets $ 781,437,000 $ 792,399,000  
Accumulated depreciation and amortization (291,595,000) (240,662,000)  
Gross intangible lease liabilities 207,355,000 194,625,000  
Accumulated depreciation and amortization (108,545,000) (90,445,000)  
Net intangible lease liabilities 98,810,000 104,180,000  
Remaining weighted-average amortization period of intangible assets 15 years 15 years  
Approximate remaining weighted-average amortization period of unfavorable market lease intangibles 9 years 9 years  
Additional revenues from the amortization of net below market lease intangibles included in rental income 9,000,000 4,000,000 6,000,000
Additional expense from the amortization of net above market ground lease intangibles included in operating expenses 800,000 700,000 600,000
Additional expense from the amortization of lease-up and non-compete agreement intangibles included in depreciation and amortization expense 59,000,000 44,000,000 45,000,000
Estimated aggregate amortization of Intangible Assets      
Estimated aggregate amortization of intangible assets, 2014 69,556,000    
Estimated aggregate amortization of intangible assets, 2015 65,639,000    
Estimated aggregate amortization of intangible assets, 2016 61,395,000    
Estimated aggregate amortization of intangible assets, 2017 53,847,000    
Estimated aggregate amortization of intangible assets, 2018 41,791,000    
Estimated aggregate amortization of intangible assets, thereafter 197,614,000    
Net intangible assets 489,842,000 551,737,000  
Estimate aggregate amortization of Intangible Liabilities      
Estimated aggregate amortization of intangible liabilities, 2014 16,728,000    
Estimated aggregate amortization of intangible liabilities, 2015 16,171,000    
Estimated aggregate amortization of intangible liabilities, 2016 15,643,000    
Estimated aggregate amortization of intangible liabilities, 2017 13,674,000    
Estimated aggregate amortization of intangible liabilities, 2018 11,290,000    
Estimated aggregate amortization of intangible liabilities, thereafter 25,304,000    
Net intangible lease liabilities 98,810,000 104,180,000  
Previously reported
      
Intangible assets and liabilities      
Remaining weighted-average amortization period of intangible assets   12 years  
Approximate remaining weighted-average amortization period of unfavorable market lease intangibles   8 years  
Below market
      
Intangible assets and liabilities      
Below market leases, Gross intangible lease liabilities 201,234,000 188,534,000  
Lease-up intangibles
      
Intangible assets and liabilities      
Gross intangible lease assets 578,143,000 580,319,000  
Tenant leases | Above market
      
Intangible assets and liabilities      
Gross intangible lease assets 144,355,000 153,141,000  
Ground leases | Above market
      
Intangible assets and liabilities      
Above market ground lease, Gross intangible lease liabilities 6,121,000 6,091,000  
Ground leases | Below market
      
Intangible assets and liabilities      
Gross intangible lease assets $ 58,939,000 $ 58,939,000