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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Summary of components of other comprehensive income
The cumulative balance of each component of other comprehensive income (loss) and the income tax effects allocated to each component are as follows:

   
Pension and
other post-
retirement
actuarial items
    
Currency
translation
adjustment
    
Unrealized gain
(loss) on
available-for-sale
securities
    
Total
  
                         
Balance at January 1, 2018
  
$
(69,041
)
  
$
92,954
    
$
1,801
    
$
25,714
  
Cumulative effect of accounting for adoption of ASU 2016-01
    
-
      
-
      
(1,801
)
    
(1,801
)
Other comprehensive income before reclassifications
    
5,617
      
(41,454
)
    
-
    
$
(35,837
)
Tax effect
    
(1,032
)
    
-
      
-
    
$
(1,032
)
Other comprehensive income before reclassifications, net of tax
    
4,585
      
(41,454
)
    
-
    
$
(36,869
)
Amounts reclassified out of AOCI
    
8,343
      
-
      
-
    
$
8,343
  
Tax effect
    
(2,178
)
    
-
      
-
    
$
(2,178
)
Amounts reclassified out of AOCI, net of tax
    
6,165
      
-
      
-
    
$
6,165
  
   Net comprehensive income (loss)
  
$
10,750
    
$
(41,454
)
  
$
-
    
$
(30,704
)
Balance at December 31, 2018
  
$
(58,291
)
  
$
51,500
    
$
-
    
$
(6,791
)
Other comprehensive income before reclassifications
    
(21,473
)
    
(10,126
)
    
-
    
$
(31,599
)
Tax effect
    
5,219
      
-
      
-
    
$
5,219
  
Other comprehensive income before reclassifications, net of tax
    
(16,254
)
    
(10,126
)
    
-
    
$
(26,380
)
Amounts reclassified out of AOCI
    
8,694
      
-
      
-
    
$
8,694
  
Tax effect
    
(2,169
)
    
-
      
-
    
$
(2,169
)
Amounts reclassified out of AOCI, net of tax
    
6,525
      
-
      
-
    
$
6,525
  
Net comprehensive income (loss)
  
$
(9,729
)
  
$
(10,126
)
  
$
-
    
$
(19,855
)
Balance at December 31, 2019
  
$
(68,020
)
  
$
41,374
    
$
-
    
$
(26,646
)
Other comprehensive income before reclassifications
    
(22,055
)
    
49,260
      
-
    
$
27,205
  
Tax effect
    
5,288
      
-
      
-
    
$
5,288
  
Other comprehensive income before reclassifications, net of tax
    
(16,767
)
    
49,260
      
-
    
$
32,493
  
Amounts reclassified out of AOCI
    
10,168
      
-
      
-
    
$
10,168
  
Tax effect
    
(2,456
)
    
-
      
-
    
$
(2,456
)
Amounts reclassified out of AOCI, net of tax
    
7,712
      
-
      
-
    
$
7,712
  
Net comprehensive income (loss)
  
$
(9,055
)
  
$
49,260
    
$
-
    
$
40,205
  
Balance at December 31, 2020
  
$
(77,075
)
  
$
90,634
    
$
-
    
$
13,559