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Goodwill And Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Changes in Carrying Amount of Goodwill by Segment
The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2019 and 2018 are as follows:
 
Industrial
Automation
 
  
Wireless
Test
 
  
Semiconductor
Test
 
  
System
Test
 
  
Total
 
  
(in thousands)
 
Balance at December 31, 2017:
   
     
     
     
     
 
Goodwill
  $
233,519
    $
361,819
    $
260,540
    $
158,699
    $
1,014,577
 
Accumulated impairment losses
   
—  
      
(353,843
 )    
(260,540
 )    
(148,183
 )    
(762,566
 )
                                         
    
233,519
     
7,976
     
—  
      
10,516
     
252,011
 
MiR acquisition
   
135,976
     
—  
      
—  
      
—  
      
135,976
 
Energid acquisition
   
14,394
     
—  
      
—  
      
—  
      
14,394
 
Foreign currency translation adjustment
   
(20,531
 )    
—  
      
—  
      
—  
      
(20,531
 )
                                         
Balance at December 31, 2018:
   
     
     
     
     
 
Goodwill
   
363,358
     
361,819
     
260,540
     
158,699
     
1,144,416
 
Accumulated impairment losses
   
—  
      
(353,843
 )    
(260,540
 )    
(148,183
 )    
(762,566
 )
                                         
    
363,358
     
7,976
     
—  
      
10,516
     
381,850
 
Lemsys acquisition
   
—  
      
—  
      
1,428
     
—  
      
1,428
 
Auto
G
uide acquisition
   
41,372
     
—  
      
—  
      
—  
      
41,372
 
Foreign currency translation adjustment
   
(8,247
 )    
—  
      
28
      
—  
      
(8,219
 )
                                         
Balance at December 31, 2019:
   
     
     
     
     
 
Goodwill
   
396,483
     
361,819
     
261,996
     
158,699
     
1,178,997
 
Accumulated impairment losses
   
—  
      
(353,843
 )    
(260,540
 )    
(148,183
 )    
(762,566
 )
                                         
   $
396,483
    $
7,976
    $
1,456
    $
10,516
    $
416,431
 
                                         
Schedule of Estimated Intangible Assets Amortization Expense Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows:
Year
 
Amortization Expense
 
  
(in thousands)
 
2020
 
$
30,606
 
2021
   
20,593
 
2022
   
19,700
 
2023
   
19,226
 
2024
   
18,921
  
Thereafter
   
16,434
 
Wireless Test  
Schedule of Amortizable Intangible Assets
Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets:
 
December 31, 2019
 
  
Gross
Carrying
Amount
 
(1
)

(2)
 
  
Accumulated
Amortization
 (2)
 
  
Foreign
Currency
Translation
Adjustment
 
  
Net
Carrying
Amount
 
  
(in thousands)
 
Developed technology
  $
361,787
    $
(279,000
 )   $
(5,709
 )   $
77,078
 
Customer relationships
   
75,669
     
(59,077
 )    
(455
 )    
16,137
 
Tradenames and trademarks
   
70,120
     
(36,671
 )    
(1,184
 )    
32,265
 
Backlog
    
260
     
(260
 )    
—  
      
—  
  
Total intangible assets
 
$
 
507,836
   
$
 
(375,008
 )  
$
 
(7,348
)
 		  
$
125,480
  
                                 
  
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