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Intangible Assets Other Than Goodwill (Tables)
 3 Months Ended
Mar. 31, 2018
Intangible Assets
Intangible assets as of March 31, 2018 and December 31, 2017 include the following (in thousands, except for weighted useful lives):

 
        
March 31, 2018
    
December 31, 2017
  
   
Weighted
Useful
Lives
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Amount
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Amount
  
   
(Years)
                                      
Amortized Intangible Assets:
                                          
Licenses
    
5.81
    
$
20,130
    
$
(18,900
)
  
$
1,230
    
$
20,130
    
$
(18,620
)
  
$
1,510
  
Product lines
    
10.36
      
33,858
      
(14,065
)
    
19,793
      
33,858
      
(13,178
)
    
20,680
  
Customer relationships
    
4.90
      
3,152
      
(3,152
)
    
—
      
3,152
      
(3,152
)
    
—
  
Trade names
    
5.00
      
3,000
      
(3,000
)
    
—
      
3,000
      
(3,000
)
    
—
  
Non-compete agreements
    
5.00
      
200
      
(200
)
    
—
      
200
      
(200
)
    
—
  
Total amortized intangible assets
          
$
60,340
    
$
(39,317
)
  
$
21,023
    
$
60,340
    
$
(38,150
)
  
$
22,190
  
Unamortized Intangible Assets:
                                                        
Trademarks
          
$
300
    
$
—
    
$
300
    
$
300
    
$
—
    
$
300