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Acquired Intangible Assets
 3 Months Ended
Mar. 31, 2016
Acquired Intangible Assets [Abstract]  
Acquired Intangible Assets
Note 6.Acquired Intangible Assets

Acquired identifiable intangible assets consist of the following:

  
March 31,
2016
  
December 31,
2015
 
  
(In thousands)
 
       
Customer relationships
 
$
48,368
  
$
48,475
 
Trademarks and trade names
  
6,800
   
6,800
 
Non-compete agreements
  
970
   
970
 
Patents and supply contracts
  
723
   
723
 
Leaseholds
  
160
   
160
 
Total acquired intangible assets
  
57,021
   
57,128
 
Less accumulated amortization (1)
  
(30,222
)
  
(29,040
)
Net acquired intangible assets
 
$
26,799
  
$
28,088
 

 (1)Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.
 
Total amortization expense for acquired intangible assets was $1.2 million and $1.3 million for the three months ended March 31, 2016 and 2015, respectively.  Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $3.6 million for the remainder of 2016, $4.7 million in 2017, $4.5 million in 2018, $3.8 million in 2019 and $5 million in the aggregate for the years 2020 through 2029.