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Identified Intangible Assets and Liabilities
6 Months Ended
Jun. 30, 2013
Identified Intangible Assets and Liabilities [Abstract]  
Identified Intangible Assets and Intangible Liabilities

9. Identified Intangible Assets and Liabilities

 

 

The following summarizes our identified intangible assets (primarily acquired in-place and above-market leases) and liabilities (primarily acquired below-market leases) as of June 30, 2013 and December 31, 2012.

 

   Balance as of 
  June 30, December 31, 
 (Amounts in thousands)2013 2012 
 Identified intangible assets:      
 Gross amount$ 654,964 $ 753,022 
 Accumulated amortization  (365,854)   (346,664) 
 Net$ 289,110 $ 406,358 
 Identified intangible liabilities (included in deferred revenue):      
 Gross amount$ 816,671 $ 902,525 
 Accumulated amortization  (363,687)   (341,536) 
 Net$ 452,984 $ 560,989 

Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental income of $11,672,000 and $12,570,000 for the three months ended June 30, 2013 and 2012, respectively, and $28,506,000 and $26,313,000 for the six months ended June 30, 2013 and 2012, 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, 2014 is as follows:

 (Amounts in thousands)   
 2014$ 41,069 
 2015  38,263 
 2016  36,321 
 2017  30,936 
 2018  29,171 

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $16,992,000 and $12,807,000 for the three months ended June 30, 2013 and 2012, respectively, and $42,086,000 and $24,024,000 for the six months ended June 30, 2013 and 2012, 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, 2014 is as follows:

 (Amounts in thousands)   
 2014$ 27,533 
 2015  22,369 
 2016  19,189 
 2017  16,029 
 2018  11,830 

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 $1,622,000 and $312,000 for the three months ended June 30, 2013 and 2012, respectively, and $2,723,000 and $582,000 for the six months ended June 30, 2013 and 2012, respectively. Estimated annual amortization of these below-market leases, net of above-market leases for each of the five succeeding years commencing January 1, 2014 is as follows:

 

 (Amounts in thousands)   
 2014$ 3,921 
 2015  3,921 
 2016  3,921 
 2017  3,921 
 2018  3,921