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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
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
  
-
   
(34,513
)
  
-
  
$
(34,513
)
Tax effect
  
-
   
-
   
-
  
$
-
 
Other comprehensive income before reclassifications, net of tax
  
-
   
(34,513
)
  
-
  
$
(34,513
)
Amounts reclassified out of AOCI
  
4,547
   
-
   
-
  
$
4,547
 
Tax effect
  
(1,365
)
  
-
   
-
  
$
(1,365
)
Amounts reclassified out of AOCI, net of tax
  
3,182
   
-
   
-
  
$
3,182
 
Net other comprehensive income
 
$
3,182
  
$
(34,513
)
 
$
-
  
$
(31,331
)
Balance at June 30, 2018
 
$
(65,859
)
 
$
58,441
  
$
-
  
$
(7,418
)