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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Apr. 01, 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
  
-
   
17,293
   
418
  
$
17,711
 
Tax effect
  
-
   
-
   
(147
)
 
$
(147
)
Other comprehensive income before reclassifications, net of tax
  
-
   
17,293
   
271
  
$
17,564
 
Amounts reclassified out of AOCI
  
3,299
   
-
   
-
  
$
3,299
 
Tax effect
  
(964
)
  
-
   
-
  
$
(964
)
Amounts reclassified out of AOCI, net of tax
  
2,335
   
-
   
-
  
$
2,335
 
Net other comprehensive income
 
$
2,335
  
$
17,293
  
$
271
  
$
19,899
 
Balance at April 1, 2017
 
$
(62,161
)
 
$
(13,973
)
 
$
1,381
  
$
(74,753
)