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Identified Intangible Assets and Liabilities
9 Months Ended
Sep. 30, 2012
Identified Intangible Assets and Liabilities [Abstract]  
Identified Intangible Assets and Intangible Liabilities

10. Identified Intangible Assets and Liabilities

 

 

The following summarizes our identified intangible assets (primarily acquired above-market leases) and liabilities (primarily acquired below-market leases) as of September 30, 2012 and December 31, 2011.

 

   Balance as of 
  September 30, December 31, 
 (Amounts in thousands)2012 2011 
 Identified intangible assets:      
 Gross amount$ 615,199 $ 642,471 
 Accumulated amortization  (362,516)   (347,039) 
 Net$ 252,683 $ 295,432 
 Identified intangible liabilities (included in deferred revenue):      
 Gross amount$ 816,774 $ 830,411 
 Accumulated amortization  (398,262)   (367,525) 
 Net$ 418,512 $ 462,886 

Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental income of $13,242,000 and $15,847,000 for the three months ended September 30, 2012 and 2011, respectively, and $39,228,000 and $48,681,000 for the nine months ended September 30, 2012 and 2011, respectively. Estimated annual amortization of acquired below-market leases, net of acquired above-market leases, for each of the five succeeding years commencing January 1, 2013 is as follows:

 (Amounts in thousands)   
 2013$ 42,023 
 2014  36,603 
 2015  33,816 
 2016  31,333 
 2017  25,841 

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $11,940,000 and $15,397,000 for the three months ended September 30, 2012 and 2011, respectively, and $38,361,000 and $42,090,000 for the nine months ended September 30, 2012 and 2011, respectively. Estimated annual amortization of all other identified intangible assets including acquired in-place leases, customer relationships, and third party contracts for each of the five succeeding years commencing January 1, 2013 is as follows:

 (Amounts in thousands)   
 2013$ 40,739 
 2014  22,450 
 2015  17,244 
 2016  14,714 
 2017  11,853 

We are a tenant under ground leases for certain properties. Amortization of these acquired below-market leases, net of above-market leases resulted in an increase to rent expense of $408,000 and $344,000 for the three months ended September 30, 2012 and 2011, respectively, and $1,182,000 and $1,033,000 for the nine months ended September 30, 2012 and 2011, respectively. Estimated annual amortization of these below-market leases, net of above-market leases for each of the five succeeding years commencing January 1, 2013 is as follows:

 

 (Amounts in thousands)   
 2013$ 1,472 
 2014  1,457 
 2015  1,457 
 2016  1,457 
 2017  1,457