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Identified Intangible Assets and Liabilities
6 Months Ended
Jun. 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 June 30, 2012 and December 31, 2011.

 

   Balance as of 
  June 30, December 31, 
 (Amounts in thousands)2012 2011 
 Identified intangible assets:      
 Gross amount$ 615,446 $ 642,565 
 Accumulated amortization  (349,060)   (347,105) 
 Net$ 266,386 $ 295,460 
 Identified intangible liabilities (included in deferred revenue):      
 Gross amount$ 819,397 $ 830,411 
 Accumulated amortization  (386,293)   (367,525) 
 Net$ 433,104 $ 462,886 

Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental income of $12,411,000 and $16,427,000 for the three months ended June 30, 2012 and 2011, respectively, and $25,986,000 and $32,772,000 for the six months ended June 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$ 43,597 
 2014  37,331 
 2015  34,260 
 2016  31,212 
 2017  25,704 

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $14,492,000 and $13,060,000 for the three months ended June 30, 2012 and 2011, respectively, and $26,424,000 and $26,715,000 for the six months ended June 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$ 40,047 
 2014  21,670 
 2015  16,700 
 2016  14,173 
 2017  11,571 

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 June 30, 2012 and 2011, respectively, and $774,000 and $688,000 for the six months ended June 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