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Intangible Assets Other Than Goodwill (Tables)
12 Months Ended
Dec. 31, 2015
Intangible Assets and Debt Issuance Costs
Intangible assets and debt issuance costs are as follows (in thousands, except for weighted useful lives):
 
         
December 31, 2014
   
December 31, 2015
 
   
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
   
$
(85,113
)
 
$
6,375
   
$
91,488
   
$
(86,994
)
 
$
4,494
 
Product lines
   
5.74
     
66,594
     
(27,235
)
   
39,359
     
67,794
     
(32,077
)
   
35,717
 
Customer relationships
   
5.21
     
9,348
     
(7,831
)
   
1,517
     
9,348
     
(8,391
)
   
957
 
Trade names
   
5.00
     
3,000
     
(1,450
)
   
1,550
     
3,000
     
(2,050
)
   
950
 
Non-compete/ Employment contracts
   
3.90
     
3,333
     
(3,230
)
   
103
     
3,333
     
(3,266
)
   
67
 
Total amortized intangible assets
           
173,763
     
(124,859
)
   
48,904
     
174,963
     
(132,778
)
   
42,185
 
Deferred Costs:
                                                       
Debt issuance costs
   
3.77
     
14,923
     
(6,418
)
   
8,505
     
11,433
     
(4,782
)
   
6,651
 
Unamortized Intangible Assets:
                                                       
Trademarks
           
2,308
     
     
2,308
     
2,308
     
     
2,308
 
            $
190,994
   
$
(131,277
)
 
$
59,717
   
$
188,704
   
$
(137,560
)
 
$
51,144
 
Future Amortization Expenses
The Company currently estimates continuing future amortization expense to be approximately (in thousands):
 
2016
 
$
11,780
 
2017
   
10,589
 
2018
   
7,667
 
2019
   
5,255
 
2020
   
4,592
 
Thereafter
   
8,953
 
   
$
48,836