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Accumulated Other Comprehensive (Loss) Income
12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss)
K.    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

(Losses)

Gains on

Marketable

Securities
 
 
Retirement

Plans
 
Prior

Service

Credit
 
 
Total
 
 
  
(in thousands)
 
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
    
 
 
   
 
 
   
 
 
   
 
 
 
Other comprehensive income before
 
reclassifications, net of tax of $0, $1,629, $0
  
 
48,903
 
 
 
5,839
 
 
 
—  
 
 
 
54,742
 
Amounts reclassified from accumulated other
 
comprehensive income, net of tax of $0, $(665), $(2)
  
 
—  
 
 
 
(2,365
 
 
(7
 
 
(2,372
    
 
 
   
 
 
   
 
 
   
 
 
 
Net current period other comprehensive income (loss),
 
net of tax of $0, $964, $(2)
  
 
48,903
 
 
 
3,474
 
 
 
(7
 
 
52,370
 
    
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126)
  
$
25,389
 
 
$
6,954
 
 
$
1,173
 
 
$
33,516
 
    
 
 
   
 
 
   
 
 
   
 
 
 
Reclassifications out of accumulated other comprehensive income to the statements of operations for the years ended December 31, 2020, 2019, and 2018, were as follows:
 
Details about Accumulated
Other Comprehensive Income
Components
  
For the year ended
 
 
Affected Line Item

in the Statements

of Operations
 
 
  
December 31,

2020
 
  
December 31,

2019
 
  
December 31,

2018
 
 
 
 
 
  
(in thousands)
 
 
 
 
Available-for-sale marketable securities
  
     
  
     
  
     
 
     
Unrealized gains (losses), net of tax of $665, $192, $21
  
$
2,365
 
  
$
690
 
  
$
(1,337
 
 
Interest income
(expense)
 
 
Defined benefit pension and postretirement plans:
  
     
  
     
  
     
 
     
Amortization of prior service benefit, net of tax of $2, $43, $71
  
 
7
 
  
 
148
 
  
 
245
 
 
 
(a)
 
    
 
 
    
 
 
    
 
 
         
Total reclassifications, net of tax of $667, $235, $92
  
$
2,372
 
  
$
838
 
  
$
(1,092
 
 
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.”