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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets [Abstract]  
Goodwill and Intangible Assets
(4)         Goodwill and Intangible Assets

The change in the carrying amount of goodwill for the three months ended March 31, 2013, is as follows:

Balance as of December 31, 2012
 $37,312 
Translation effect
  (886)
Balance as of March 31, 2013
 $36,426 

Acquired intangible assets, which are amortized, consist of the following:

     
As of March 31, 2013
 
 
Amortization
Period
 
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Net Carrying
Amount
 
             
Technology-based intangibles
20 years
 $3,894  $(584) $3,310 
Customer-related intangibles
10 - 15 years
  755   (155)  600 
     $4,649  $(739) $3,910 

     
As of December 31, 2012
 
 
Amortization
Period
 
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Net Carrying
Amount
 
             
Technology-based intangibles
20 years
 $4,011  $(552) $3,459 
Customer-related intangibles
10 - 15 years
  778   (146)  632 
     $4,789  $(698) $4,091 

The change in the gross carrying amount is primarily due to the impact of foreign currency translation.
 
Amortization expense was $64 and $63 for the three months ended March 31, 2013 and 2012, respectively.

Amortization expense related to current intangible assets is expected to be approximately $250 for 2013 and for each of the next four years.