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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Measurements [Abstract]  
Schedule of fair Value, Assets and Liabilities Measured on Recurring basis
The following table provides the financial assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2012 and 2011:

 
   
  
  
 
 
 
Total
Fair Value
  
Level 1
  
Level 2
  
Level 3
 
December 31, 2012
 
  
  
  
 
Assets:
 
  
  
  
 
Assets held in rabbi trusts
 
$
33,751
  
$
21,954
  
$
11,797
  
$
-
 
Available for sale securities
 
$
7,580
   
7,580
   
-
   
-
 
U.S. Defined Benefit Pension Plan Assets:
                
     Equity securities
 
$
153,829
   
153,829
   
-
   
-
 
     Fixed income securities
 
$
99,669
   
42,006
   
57,663
   
-
 
     Real Estate Investment Trust securities
 
$
6,518
   
6,518
   
-
   
-
 
     Cash
 
$
5,850
   
5,850
   
-
   
-
 
Non - U.S. Defined Benefit Pension Plan Assets:
                
     Equity securities
 
$
8,888
   
8,888
   
-
   
-
 
     Fixed income securities
 
$
14,437
   
14,437
   
-
   
-
 
     Cash
 
$
23,255
   
23,255
   
-
   
-
 
 
 
$
353,777
  
$
284,317
  
$
69,460
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(622
)
  
-
   
-
   
(622
)
Embedded derivative - convertible debentures due 2041
 
$
(399
)
  
-
   
-
   
(399
)
Embedded derivative - convertible debentures due 2042
 
$
(282
)
  
-
   
-
   
(282
)
 
 
$
(1,303
)
 
$
-
  
$
-
  
$
(1,303
)
 
                
December 31, 2011
                
Assets:
                
Assets held in rabbi trusts
 
$
31,698
  
$
20,569
  
$
11,129
  
$
-
 
Available for sale securities
 
$
6,776
   
6,776
   
-
   
-
 
U.S. Defined Benefit Pension Plan Assets:
                
     Equity securities
 
$
138,379
   
138,379
   
-
   
-
 
     Fixed income securities
 
$
93,842
   
40,606
   
53,236
   
-
 
     Real Estate Investment Trust securities
 
$
6,486
   
6,486
   
-
   
-
 
     Cash
 
$
338
   
338
   
-
   
-
 
Non - U.S. Defined Benefit Pension Plan Assets:
                
     Equity securities
 
$
6,815
   
6,815
   
-
   
-
 
     Fixed income securities
 
$
10,173
   
10,173
   
-
   
-
 
     Cash
 
$
18,556
   
18,556
   
-
   
-
 
 
 
$
313,063
  
$
248,698
  
$
64,365
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(594
)
  
-
   
-
   
(594
)
Embedded derivative - convertible debentures due 2041
 
$
(392
)
  
-
   
-
   
(392
)
 
 
$
(986
)
 
$
-
  
$
-
  
$
(986
)