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Real Estate (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
Land $ 2,012,905,000   $ 2,011,947,000
Building 7,359,342,000   7,359,342,000
Building and tenant improvements 708,327,000   683,983,000
Other rental property 866,637,000   877,578,000
Real estate, gross 10,947,211,000   10,932,850,000
Accumulated depreciation and amortization (1,957,169,000)   (1,880,685,000)
Real estate, net 8,990,042,000   9,052,165,000
Accumulated amortization 615,900,000   606,500,000
Intangible liabilities relating to below-market leases 500,700,000   505,800,000
Accumulated amortization on below-market leases 245,300,000   237,200,000
Above- and below-market lease intangible amortization (11,018,000) $ (13,530,000)  
Amortization of Intangible Assets 18,100,000 $ 25,100,000  
Acquired Land Parcels [Member]      
Tenant relationships and leases in place amortization      
Acquired real estate properties 2    
Acquired Outparcels [Member]      
Tenant relationships and leases in place amortization      
Acquired real estate properties 1    
Aggregate purchase price 1,200,000    
Leases, Acquired-in-Place [Member]      
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
In-place lease value 786,900,000   796,800,000
Above Market Leases [Member]      
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
Above market leases 79,700,000   $ 80,800,000
Above- and Below-Market Lease Accretion, Net [Member]      
Above- and below-market lease accretion, net      
2016 (remaining nine months) (25,207,000)    
2017 (29,557,000)    
2018 (26,609,000)    
2019 (22,303,000)    
2020 (17,749,000)    
Tenant Relationships and Leases-in-Place Amortization [Member]      
Tenant relationships and leases in place amortization      
2016 (remaining nine months) 41,111,000    
2017 41,560,000    
2018 32,252,000    
2019 25,428,000    
2020 $ 19,160,000