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Identified Intangible Assets and Intangible Liabilities (Tables)
12 Months Ended
Dec. 31, 2014
Finite-Lived Intangible Assets And Liabilities [Line Items]  
Schedule of Identified Intangible Assets and Intangible Liabilities (Table)
   Balance as of December 31, 
 (Amounts in thousands)2014 2013 
 Identified intangible assets:      
 Gross amount$ 424,976 $ 505,203 
 Accumulated amortization  (199,821)   (252,121) 
 Net$ 225,155 $ 253,082 
 Identified intangible liabilities (included in deferred revenue):      
 Gross amount$ 657,976 $ 622,685 
 Accumulated amortization  (329,775)   (295,768) 
 Net$ 328,201 $ 326,917 
Below Market Leases Net Of Above Market Leases [Member]  
Finite-Lived Intangible Assets And Liabilities [Line Items]  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
 (Amounts in thousands)   
 2015$ 49,550 
 2016  37,894 
 2017  35,069 
 2018  34,166 
 2019  23,928 
Other Identified Intangible Assets [Member]  
Finite-Lived Intangible Assets And Liabilities [Line Items]  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
 (Amounts in thousands)   
 2015$ 25,735 
 2016  20,122 
 2017  16,619 
 2018  12,417 
 2019  10,470 
Tenant Under Ground Leases [Member]  
Finite-Lived Intangible Assets And Liabilities [Line Items]  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
 (Amounts in thousands)   
 2015$ 1,832 
 2016  1,832 
 2017  1,832 
 2018  1,832 
 2019  1,832