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Intangible Assets Other Than Goodwill (Tables)
 6 Months Ended
Jun. 30, 2017
Intangible Assets
Intangible assets as of June 30, 2017 and December 31, 2016 include the following (in thousands, except for weighted useful lives):

 
        
June 30, 2017
    
December 31, 2016
  
   
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
    
$
(17,833
)
  
$
2,297
    
$
20,130
    
$
(17,248
)
  
$
2,882
  
Product lines
  
7.50
      
50,093
      
(23,807
)
    
26,286
      
50,093
      
(20,634
)
    
29,459
  
Customer relationships
  
4.90
      
3,152
      
(2,927
)
    
225
      
3,152
      
(2,755
)
    
397
  
Trade names
  
5.00
      
3,000
      
(2,950
)
    
50
      
3,000
      
(2,650
)
    
350
  
Non-compete agreements
  
5.00
      
200
      
(197
)
    
3
      
200
      
(177
)
    
23
  
Total amortized intangible assets
        
$
76,575
    
$
(47,714
)
  
$
28,861
    
$
76,575
    
$
(43,464
)
  
$
33,111
  
Unamortized Intangible Assets:
                                                      
Trademarks
        
$
2,608
    
$
—
    
$
2,608
    
$
2,608
    
$
—
    
$
2,608