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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
 
$
(64,496
)
 
$
(31,266
)
  
1,110
  
$
(94,652
)
Other comprehensive income before reclassifications
  
-
   
98,965
   
1,542
  
$
100,507
 
Tax effect
  
-
   
-
   
(540
)
 
$
(540
)
Other comprehensive income before reclassifications, net of tax
  
-
   
98,965
   
1,002
  
$
99,967
 
Amounts reclassified out of AOCI
  
6,918
   
-
   
-
  
$
6,918
 
Tax effect
  
(2,075
)
  
-
   
-
  
$
(2,075
)
Amounts reclassified out of AOCI, net of tax
  
4,843
   
-
   
-
  
$
4,843
 
Net other comprehensive income
 
$
4,843
  
$
98,965
  
$
1,002
  
$
104,810
 
Balance at September 30, 2017
 
$
(59,653
)
 
$
67,699
  
$
2,112
  
$
10,158