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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Changes in Accumulated Other Comprehensive (Loss) Income
Changes in accumulated other comprehensive (loss) income, which is presented net of tax, consist of the following:
                                 
 
Foreign
Currency
Translation
Adjustment
 
  
Unrealized
Gain
s
(Losses)
 
on
Marketable
Securities
 
  
Retirement
Plans Prior
Service
Credit
 
  
Total
 
 
(in thousands)
 
Balance at December 31, 2017, net of tax of $0, $1,815, $(932)
  $
15,919
    $
1,362
    $
1,495
    $
18,776
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other comprehensive
loss
before reclassifications, net of tax of $0, $(722), $0
   
(28,442
 )    
(2,110
 )    
—  
      
(30,552
 )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(21), $(71)
   
—  
      
1,337
     
(245
 )    
1,092
 
                                 
Net current period other comprehensive
loss
, net of tax of $0, $(743), $(71)
   
(28,442
 )    
(773
 )    
(245
 )    
(29,460
 )
                                 
Reclassification of tax effects resulting f
rom
the Tax Reform Act,
net of tax of
$0, $(691), $(78), respectively (a)
   
—  
      
691
     
78
     
769
 
Reclassification of unrealized gains on equity securities, net of tax
 of
$0, $(902), $0, respectively, (b)
   
—  
      
(3,125
 )    
—  
      
(3,125
 )
                                 
Balance at December 31, 2018, net of tax of $0, $(521), $(1,081)
 
 
(12,523
 )  
 
(1,845
 )  
 
1,328
   
 
(13,040
 )
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other comprehensive
(loss)
income before reclassifications, net of tax of $0, $1,659, $0
   
(10,991
 )    
6,015
      
—  
      
(4,976
 )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(192), $(43)
   
—  
      
(690
)     
(148
 )    
(838
) 
                                 
Net current period other comprehensive
(loss)
income, net of tax of $0, $1,467, $(43)
   
(10,991
 )    
5,325
      
(148
 )    
(5,814
 )
                                 
Balance at December 31, 2019, net of tax of $0, $946, $(1,124)
  $
(23,514
 )   $
3,480
     $
1,180
     $
(18,854
 )
                                 
 
 
 
 
 
 
 
(a) In the year ended December 31, 2018, Teradyne early adopted ASU
2018-02,
“Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.”
As a result, the stranded tax effects resulting from the Tax Reform Act enacted in December 2017 were reclassified from accumulated other comprehensive income to retained earnings.
 
 
 
 
 
 
(b) In the year ended December 31, 2018, Teradyne adopted ASU
2016-01,
“
Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities
.” See Note B: “Accounting Policies.”
 
 
 
 
 
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations
Reclassifications out of accumulated other comprehensive income to the statements of operations for the years ended December 31, 2019, 2018, and 2017, were as follows:
                                 
Details about Accumulated
Other Comprehensive Income
Components
 
For the year ended
   
Affected Line Item
in the Statements
of Operations
 
 
December 31,
2019
 
  
December 31,
2018
 
  
December 31,
2017
 
  
 
 
(in thousands)
   
 
Available-for-sale
marketable securities
    
     
     
     
 
Unrealized
gains
(losses), net of tax of $192, $21, $297
  $
690
     $
(1,337
 )   $
441
     
Interest income (expense)
 
Defined benefit pension and postretirement plans:
   
     
     
     
 
Amortization of prior service benefit, net of tax of $43, $71, $154
   
148
     
245
     
272
     
(a)
 
                                 
Total reclassifications, net of tax of $235, $92, $451
  $
838
     $
(1,092
 )   $
713
     
Net income
 
                                 
 
 
 
 
 
 
 
(a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note P: “Retirement Plans.”