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Acquired Intangible Assets
 3 Months Ended
Mar. 31, 2017
Acquired Intangible Assets [Abstract]  
Acquired Intangible Assets
Note 7.
Acquired Intangible Assets

Acquired identifiable intangible assets consist of the following:

  
March 31,
2017
  
December 31,
2016
 
  
(In thousands)
 
Customer relationships
 
$
87,220
  
$
87,070
 
Trademarks and trade names
  
6,800
   
6,800
 
Non-compete agreements
  
3,194
   
3,189
 
Patents
  
723
   
723
 
Supply agreements
  
800
   
800
 
Leaseholds
  
160
   
160
 
Total acquired intangible assets
  
98,897
   
98,742
 
Less accumulated amortization (1)
  
(37,970
)
  
(35,830
)
Net acquired intangible assets
 
$
60,927
  
$
62,912
 

(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 $2.1 million and $1.2 million for the three months ended March 31, 2017 and 2016, respectively.  Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $5.9 million for the remainder of 2017, $7.5 million in 2018, $6.3 million in 2019, $5.9 million in 2020 and $30.1 million in the aggregate for the years 2021 through 2031.