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Intangible Assets
 3 Months Ended
Mar. 31, 2012
Intangible Assets [Abstract]  
Intangible Assets
(2)           Intangible Assets

Intangible assets consist of the following (in thousands):
 
   
March 31, 2012
  
December 31, 2011
 
   
Gross
carrying
value
  
Accumulated
amortization
  
Gross
carrying
value
  
Accumulated
Amortization
 
Amortizable intangible assets
 
        Patents
 $ 2,624  $ 2,311  $ 2,624  $ 2,262 
 
 
Amortization expense related to intangible assets totaled $49,000 for the three months ended March 31, 2012 and totaled $53,000 for the three ended March 31, 2011. The aggregate estimated amortization expense for intangible assets remaining as of March 31, 2012 is as follows (in thousands):
 
 2012 $33 
 2013  44 
 2014  44 
 2015  44 
 2016  44 
 over 5 years   104 
     
 Total  $313