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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014:

 
 
Total Fair Value
  
Level 1
  
Level 2
  
Level 3
 
         
December 31, 2015
        
Assets:
        
Assets held in rabbi trusts
 
$
39,849
  
$
25,906
  
$
13,943
  
$
-
 
Available for sale securities
 
$
3,604
   
3,604
   
-
   
-
 
U.S. Defined Benefit Pension Plan Assets:
                
Fixed income securities
 
$
255,804
   
254,555
   
1,249
   
-
 
Cash
 
$
2,288
   
2,288
   
-
   
-
 
Non - U.S. Defined Benefit Pension Plan Assets:
                
Equity securities
 
$
9,302
   
9,302
   
-
   
-
 
Fixed income securities
 
$
13,416
   
13,416
   
-
   
-
 
Cash
 
$
28,545
   
28,545
   
-
   
-
 
  
$
352,808
  
$
337,616
  
$
15,192
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(576
)
  
-
   
-
   
(576
)
Embedded derivative - convertible debentures due 2041
 
$
(438
)
  
-
   
-
   
(438
)
Embedded derivative - convertible debentures due 2042
 
$
(302
)
  
-
   
-
   
(302
)
  
$
(1,316
)
 
$
-
  
$
-
  
$
(1,316
)
                 
December 31, 2014
                
Assets:
                
Assets held in rabbi trusts
 
$
40,270
  
$
26,853
  
$
13,417
  
$
-
 
Available for sale securities
 
$
15,432
   
4,439
   
10,993
   
-
 
U.S. Defined Benefit Pension Plan Assets:
                
Equity securities
 
$
26,601
   
26,601
   
-
   
-
 
Fixed income securities
 
$
244,037
   
242,749
   
1,288
   
-
 
Cash
 
$
3,006
   
3,006
   
-
   
-
 
Non - U.S. Defined Benefit Pension Plan Assets:
                
Equity securities
 
$
9,268
   
9,268
   
-
   
-
 
Fixed income securities
 
$
18,269
   
18,269
   
-
   
-
 
Cash
 
$
21,619
   
21,619
   
-
   
-
 
  
$
378,502
  
$
352,804
  
$
25,698
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(526
)
  
-
   
-
   
(526
)
Embedded derivative - convertible debentures due 2041
 
$
(341
)
  
-
   
-
   
(341
)
Embedded derivative - convertible debentures due 2042
 
$
(238
)
  
-
   
-
   
(238
)
 
 
$
(1,105
)
 
$
-
  
$
-
  
$
(1,105
)