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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 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, 2013
 
$
(178,956
)
 
$
167,461
  
$
1,273
  
$
(10,222
)
Other comprehensive income before reclassifications
  
52,545
   
23,537
   
913
  
$
76,995
 
Tax effect
  
(16,334
)
  
-
   
(299
)
 
$
(16,633
)
Other comprehensive income before reclassifications, net of tax
  
36,211
   
23,537
   
614
  
$
60,362
 
Amounts reclassified out of AOCI
  
19,112
   
-
   
(2,019
)
 
$
17,093
 
Tax effect
  
(6,285
)
  
-
   
686
  
$
(5,599
)
Amounts reclassified out of AOCI, net of tax
  
12,827
   
-
   
(1,333
)
 
$
11,494
 
Net comprehensive income
 
$
49,038
  
$
23,537
  
$
(719
)
 
$
71,856
 
Balance at December 31, 2013
 
$
(129,918
)
 
$
190,998
  
$
554
  
$
61,634
 
Other comprehensive income before reclassifications
  
(60,602
)
  
(106,295
)
  
2,175
  
$
(164,722
)
Tax effect
  
18,117
   
-
   
(758
)
 
$
17,359
 
Other comprehensive income before reclassifications, net of tax
  
(42,485
)
  
(106,295
)
  
1,417
  
$
(147,363
)
Amounts reclassified out of AOCI
  
25,604
   
-
   
(78
)
 
$
25,526
 
Tax effect
  
(8,961
)
  
-
   
24
  
$
(8,937
)
Amounts reclassified out of AOCI, net of tax
  
16,643
   
-
   
(54
)
 
$
16,589
 
Net comprehensive income (loss)
 
$
(25,842
)
 
$
(106,295
)
 
$
1,363
  
$
(130,774
)
Balance at December 31, 2014
 
$
(155,760
)
 
$
84,703
  
$
1,917
  
$
(69,140
)
Other comprehensive income before reclassifications
  
15,169
   
(80,106
)
  
(1,503
)
 
$
(66,440
)
Tax effect
  
(4,196
)
  
-
   
526
  
$
(3,670
)
Other comprehensive income before reclassifications, net of tax
  
10,973
   
(80,106
)
  
(977
)
 
$
(70,110
)
Amounts reclassified out of AOCI
  
12,869
   
-
   
(680
)
 
$
12,189
 
Tax effect
  
(4,504
)
  
-
   
238
  
$
(4,266
)
Amounts reclassified out of AOCI, net of tax
  
8,365
   
-
   
(442
)
 
$
7,923
 
Net comprehensive income (loss)
 
$
19,338
  
$
(80,106
)
 
$
(1,419
)
 
$
(62,187
)
Balance at December 31, 2015
 
$
(136,422
)
 
$
4,597
  
$
498
  
$
(131,327
)