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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020 and 2019 are as follows:
 
 
  
Industrial

Automation
 
 
Wireless

Test
 
 
Semiconductor

Test
 
 
System

Test
 
 
Total
 
 
  
(in thousands)
 
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
 
AutoGuide 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
 
AutoGuide acquisition
  
 
(149
) 
 
 
—  
 
 
 
—  
 
 
 
—  
 
 
 
(149
) 
Foreign currency translation adjustment
  
 
37,418
 
 
 
—  
 
 
 
159
 
 
 
—  
 
 
 
37,577
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31, 2020:
  
      
 
      
 
      
 
      
 
      
Goodwill
  
 
433,752
 
 
 
361,819
 
 
 
262,155
 
 
 
158,699
 
 
 
1,216,425
 
Accumulated impairment losses
  
 
—  
 
 
 
(353,843
) 
 
 
(260,540
) 
 
 
(148,183
) 
 
 
(762,566
) 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
 
  
$
433,752
 
 
$
7,976
 
 
$
1,615
 
 
$
10,516
 
 
$
453,859
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Intangible Assets
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)
 
2021
  
$
21,893
 
2022
  
 
21,000
 
2023
  
 
20,504
 
2024
  
 
20,192
 
2025
  
 
11,922
 
Thereafter
  
 
5,428
 
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, 2020
 
 
  
Gross

Carrying

Amount
 
(1)
 
  
Accumulated

Amortization (1)
 
 
Foreign
Currency
Translation
Adjustment
 
 
Net

Carrying

Amount
 
 
  
(in thousands)
 
Developed technology
  
$
272,547
 
  
$
(210,479
) 
 
$
(1,610
) 
 
$
60,458
 
Customer relationships
  
 
66,239
 
  
 
(54,524
) 
 
 
305
 
 
 
12,020
 
Tradenames and trademarks
  
 
70,120
 
  
 
(42,344
) 
 
 
685
 
 
 
28,461
 
    
 
 
     
 
 
    
 
 
    
 
 
  
Total intangible assets
  
$
408,906
 
  
$
(307,347
) 
 
$
(620
) 
 
$
100,939
 
    
 
 
     
 
 
    
 
 
    
 
 
  
 
  
December 31, 2019
 
 
  
Gross

Carrying

Amount
 
  
Accumulated

Amortization
 
 
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
 
    
 
 
     
 
 
    
 
 
    
 
 
  
 
(1)
In 2020, $98.9 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.