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Real Estate (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Real Estate Properties [Line Items]          
Provisions for impairment     $ 807 $ 0  
Real Estate Owned, Disclosure of Detailed Components [Abstract]          
Land $ 2,015,176   2,015,176   $ 2,000,415
Building 7,355,922   7,355,922   7,332,073
Building and tenant improvements 652,530   652,530   552,351
Other rental property 886,729   886,729   917,410
Real estate, gross 10,910,357   10,910,357   10,802,249
Accumulated depreciation and amortization (1,798,676)   (1,798,676)   (1,549,234)
Real estate, net 9,111,681   9,111,681   9,253,015
Accumulated amortization 592,700   592,700   550,400
Intangible liabilities relating to below-market leases 515,200   515,200   528,700
Accumulated amortization on below-market leases 230,900   230,900   202,700
Amortization of Intangible Assets 10,800 $ 18,100 33,500 $ 58,400  
Leases, Acquired-in-Place [Member]          
Real Estate Owned, Disclosure of Detailed Components [Abstract]          
In-place lease value 805,700   805,700   833,300
Estimated Amortization Expense of Intangible Assets and Liabilities [Abstract]          
2015 (remaining three months) 9,400   9,400    
2016 22,995   22,995    
2017 11,161   11,161    
2018 5,029   5,029    
2019 2,908   2,908    
Above Market Leases [Member]          
Real Estate Owned, Disclosure of Detailed Components [Abstract]          
Above market leases $ 81,100   $ 81,100   $ 84,100