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Intangible Assets Other Than Goodwill
 9 Months Ended
Sep. 30, 2013
Intangible Assets Other Than Goodwill
Note 13 — Intangible Assets Other Than Goodwill

Intangible assets other than goodwill consist primarily of licenses, product lines, customer relationships and trademarks. Amortized intangible assets are included in Intangibles in the accompanying balance sheets. Trademarks are disclosed separately in the accompanying balance sheets. Debt offering costs from the issuance of the Company’s convertible senior notes are included in Other Long Term Assets in the accompanying balance sheets. Intangible assets and debt issuance costs are as follows (in thousands, except for weighted useful lives):
 
     
December 31, 2012
    
September 30, 2013
  
 
Weighted
Useful
Lives
  
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Amount
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Amount
  
 
(Years)
                                    
                                       
Amortized Intangible Assets:
                                      
Licenses
4.96
  
$
91,488
    
$
(77,844
 )   
$
13,644
    
$
91,488
    
$
(81,691
 )   
$
9,797
  
Product lines
5.84
    
66,594
      
(19,561
 )     
47,033
      
66,594
      
(21,496
 )     
45,098
  
Customer relationships
5.21
    
9,347
      
(5,903
 )     
3,444
      
9,347
      
(7,041
 )     
2,306
  
Trade names
5.00
    
3,000
      
(250
 )     
2,750
      
3,000
      
(700
 )     
2,300
  
Non-compete/Employment contracts
3.90
    
3,333
      
(3,150
 )     
183
      
3,333
      
(3,180
 )     
153
  
Total amortized intangible assets
      
173,762
      
(106,708
 )     
67,054
      
173,762
      
(114,108
 )     
59,654
  
Deferred Costs:
                                                  
Debt issuance costs
5.05
    
4,224
      
(2,609
 )     
1,615
      
8,402
      
(4,124
 )     
4,278
  
Unamortized Intangible Assets:
                                                  
Trademarks
      
2,308
      
―
      
2,308
      
2,308
      
―
      
2,308
  
 Total Intangible Assets:
    
$
180,294
    
$
(109,317
 )   
$
70,977
    
$
184,472
    
$
(118,232
 )   
$
66,240
  
 
Amortization expense related to limited life intangible assets and debt issuance costs was $4.2 million and $4.8 million for the three months ended September 30, 2012 and 2013, respectively, and $6.6 million and $8.4 million for the nine months ended September 30, 2012 and 2013, respectively. Debt issuance costs in the amount of $0.6 million were written off in the third quarter of 2013 in connection with the repurchase of a portion of the convertible senior notes due in 2014.