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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income
The components of accumul
a
ted other comprehensive loss are detailed as follows (in thousands):
 
 
  
Currency
Translation
 
 
Unrealized

Loss on
Retirement Plans
 
 
Unrealized Gain
(Loss) on
Investments
 
 
Accumulated
Other
Comprehensive
Loss
 
Balance at December 31, 2018
  
$
(105,697
) 
 
$
(9,869
) 
 
$
(2,405
) 
 
$
(117,971
) 
Other comprehensive income (loss), net of tax
  
 
1,631
 
 
 
(5,536
) 
 
 
2,405
 
 
 
(1,500
) 
    
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31, 2019
  
$
(104,066
) 
 
$
(15,405
) 
 
$
—  
 
 
$
(119,471
) 
Other comprehensive loss, net of tax
  
 
5,984
 
 
 
(4,456
) 
 
 
—  
 
 
 
1,528
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31, 2020
  
$
(98,082
) 
 
$
(19,861
) 
 
$
—
 
 
$
(117,943
)