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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income
The components of accumulated other comprehensive income (loss) are detailed as follows (in thousands):
 
Currency
Translation
 
  
Unrealized Gain
(Loss) on
Retirement Plans
 
  
Unrealized Gain
(Loss) on
Investments
 
  
Accumulated
Other
Comprehensive
Income (Loss)
 
Balance at December 31, 2017
 
$
(69,418
)
 
$
(37,103
)
 
$
(3,546
)
 
$
(110,067
)
Other comprehensive (loss) income, net of tax
 
 
(36,279
)
 
 
27,234
 
 
 
1,141
 
 
 
(7,904
)
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
 )