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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015
 
$
(155,760
)
 
$
84,703
   
1,917
  
$
(69,140
)
Other comprehensive income (loss) before reclassifications
  
-
   
(60,836
)
  
(1,035
)
 
$
(61,871
)
Tax effect
  
-
   
-
   
362
  
$
362
 
Other comprehensive income (loss) before reclassifications, net of tax
  
-
   
(60,836
)
  
(673
)
 
$
(61,509
)
Amounts reclassified out of AOCI
  
6,374
   
-
   
(680
)
 
$
5,694
 
Tax effect
  
(2,183
)
  
-
   
238
  
$
(1,945
)
Amounts reclassified out of AOCI, net of tax
  
4,191
   
-
   
(442
)
 
$
3,749
 
Net other comprehensive income (loss)
 
$
4,191
  
$
(60,836
)
 
$
(1,115
)
 
$
(57,760
)
Balance at July 4, 2015
 
$
(151,569
)
 
$
23,867
  
$
802
  
$
(126,900
)