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Goodwill and Acquired Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2019
Changes in Carrying Amount of Goodwill by Segment
The changes in the carrying amount of goodwill by reportable segments for the six months ended June 30, 2019, were as follows:
                                         
 
Industrial
Automation
   
System
Test
   
Wireless
Test
   
Semiconductor
Test
   
Total
 
 
(in thousands)
 
Balance at December 31, 2018
   
     
     
     
     
 
Goodwill
  $
363,358
    $
158,699
    $
361,819
    $
260,540
    $
1,144,416
 
Accumulated impairment losses
   
—  
      
(148,183
 )    
(353,843
 )    
(260,540
 )    
(762,566
 )
                                         
   
363,358
     
10,516
     
7,976
     
—  
      
381,850
 
Lemsys acquisition
   
—  
      
—  
      
—  
      
1,428
     
1,428
 
Foreign currency translation adjustment
   
626
     
—  
      
—  
      
32
     
658
 
                                         
Balance at June 30, 2019
   
     
     
     
     
 
Goodwill
   
363,984
     
158,699
     
361,819
     
262,000
     
1,146,502
 
Accumulated impairment losses
   
—
      
(148,183
 )    
(353,843
 )    
(260,540
 )    
(762,566
 )
                                         
  $
363,984
    $
10,516
    $
7,976
    $
1,460
    $
383,936
 
                                         
 
Schedule of Estimated Intangible Assets Amortization Expense
Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:
         
Year
 
Amortization Expense
 
 
(in thousands)
 
2019 (remainder)
   
18,745
 
2020
   
25,037
 
2021
   
14,778
 
2022
   
13,885
 
2023
   
13,410
 
Thereafter
   
23,639
 
 
 
Wireless Test  
Schedule of Amortizable Intangible Assets
Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
                                 
 
June 30, 2019
 
 
Gross
Carrying
Amount (1)(2)
   
Accumulated
Amortization (2)
   
Foreign
Currency
Translation
Adjustment
   
Net
Carrying
Amount
 
 
(in thousands)
 
Developed technology
  $
337,198
    $
(265,951
 )   $
(4,035
 )   $
67,212
 
Customer relationships
   
100,313
     
(87,496
 )    
(285
 )    
12,532
 
Tradenames and trademarks
   
64,670
     
(34,131
 )    
(789
 )    
29,750
 
                                 
Total intangible assets
  $
502,181
    $
(387,578
 )   $
(5,109
 )   $
109,494
 
                                 
 
 
 
 
 
 
  
December 31, 2018
 
 
Gross
Carrying
Amount
   
Accumulated
Amortization
   
Foreign
Currency
Translation
Adjustment
   
Net
Carrying
Amount
 
 
(in thousands)
 
Developed technology
  $
336,308
    $
(252,080
 )   $
(4,079
 )   $
80,149
 
Customer relationships
   
97,153
     
(83,448
 )    
(340
 )    
13,365
 
Tradenames and trademarks
   
64,420
     
(31,653
 )    
(799
 )    
31,968
 
Non-compete
agreement
    
320
     
(320
 )    
—  
      
—  
  
Backlog
   
30
     
(30
 )    
—  
      
—  
  
                                 
Total intangible assets
  $
498,231
    $
(367,531
 )   $
(5,218
 )   $
125,482