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Goodwill And Intangible Assets
9 Months Ended
Sep. 30, 2011
Goodwill And Intangible Assets 
Goodwill And Intangible Assets
6. 
Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. Intangible assets resulting from the acquisitions of entities accounted for using the purchase method of accounting are recorded at the estimated fair value of the assets acquired. Identifiable intangible assets are comprised of purchased customer relationships, trademarks and tradenames, developed technologies and other intangible assets. The fair values of these identified intangible assets are based upon expected future cash flows or income, which take into consideration certain assumptions such as customer turnover, tradenames and patent lives. These determinations are primarily based upon the Company's historical experience and expected benefit of each intangible asset. If it is determined that such assumptions are not accurate, then the resulting change will impact the fair value of the intangible asset. Identifiable intangible assets are amortized using the straight-line method over estimated useful lives ranging from one to 20 years.

The changes in carrying amounts of goodwill for the nine months ended September 30, 2011 are as follows (in thousands):

Balance as of January 1, 2011
 
$
281,848
 
Goodwill acquired
   
2,311
 
Purchase Accounting Adjustments
   
(5,156
)
Foreign Exchange Translation
   
4
 
Balance as of September 30, 2011
 
$
279,007
 

 
Intangible assets are summarized as of September 30, 2011 as follows (in thousands):

Intangible assets with indefinite lives:

Tradename
 
$
29,653
 
Other
   
5,196
 
          Total
 
$
34,849
 


Intangible assets subject to amortization:
 
 
Weighted-Average
  Amortization
 
Historical
   
Accumulated
       
 
Period
 
Cost
   
Amortization
   
Net
 
Tradenames
13.7 years
 
$
9,188
   
$
(3,901
)
 
$
5,287
 
Patent and patent licenses
8.4 years
   
37,451
     
(19,843
)
   
17,608
 
Customer relationships
6.7 years
   
49,317
     
(11,780
)
   
37,537
 
Other purchased intangibles
4.7 years
   
11,424
     
(6,336
)
   
5,088
 
Total
   
$
107,380
   
$
(41,860
)
 
$
65,520
 
 
 
Amortization expense, included in general and administrative expense, approximated $3.4 million and $1.7 million for the three month period ended September 30, 2011 and 2010, respectively, and $10.1 million and $6.6 million for the nine month period ended September 30, 2011 and 2010, respectively.  Amortization expense is estimated to approximate $13.3 million, $12.3 million, $11.7 million, $10.8 million and $10.0 million for fiscal years 2011 through 2015, respectively, and $17.4 million thereafter through the duration of the amortization period.