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Intangible Assets
 6 Months Ended
Jun. 30, 2011
Intangible Assets  
Intangible Assets
(5) Intangible Assets
Intangible assets other than goodwill at June 30, 2011 and December 31, 2010 were as follows:
                                                 
    2011     2010  
            Accumulated                     Accumulated        
(in thousands)   Cost     Amortization     Net     Cost     Amortization     Net  
Licenses
   $ 5,875     $ (5,875 )   $ —     $ 5,875     $ (5,875 )   $ —  
Patent costs
     16,365       (13,820 )     2,545       16,296       (13,632 )     2,664  
Acquired technology
     11,186       (10,447 )     739       11,064       (10,304 )     760  
Internally developed software
     15,764       (9,296 )     6,468       9,984       (8,936 )     1,048  
Customer relationships
     16,215       (960 )     15,255       10,253       (300 )     9,953  
Non-compete agreements
     7,566       (1,373 )     6,193       3,875       (840 )     3,035  
Trade names
     4,056       (111 )     3,945       883       (68 )     815  
Other
     1,482       (1,222 )     260       974       (974 )     —  
 
                                    
Total
   $ 78,509     $ (43,104 )   $ 35,405     $ 59,204     $ (40,929 )   $ 18,275  
 
                                    
For the six months ended June 30, 2011 and 2010, the Company capitalized $211 and $192, respectively, of costs incurred to acquire, develop and extend patents in the United States and various other countries.
Amortization expense for intangible assets for quarter and six months ended June 30, 2011 was $1,111 and $1,951, respectively, compared to $339 and $562 for the quarter and six months ended June 30, 2010.
Annual amortization expense for intangible assets for 2011, 2012, 2013, 2014 and 2015 is expected to be $4,607; $4,095; $4,076; $4,069 and $3,954, respectively.