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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015:

 
 
Total Fair Value
  
Level 1
  
Level 2
  
Level 3
 
             
December 31, 2016
            
Assets:
            
Assets held in rabbi trusts
 
$
41,917
  
$
27,297
  
$
14,620
  
$
-
 
Available for sale securities
 
$
3,969
   
3,969
   
-
   
-
 
Non - U.S. Defined Benefit Pension Plan Assets:
                
Equity securities
 
$
9,963
   
9,963
   
-
   
-
 
Fixed income securities
 
$
12,780
   
12,780
   
-
   
-
 
Cash
 
$
43,347
   
43,347
   
-
   
-
 
  
$
111,976
  
$
97,356
  
$
14,620
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(393
)
  
-
   
-
   
(393
)
Embedded derivative - convertible debentures due 2041
 
$
(285
)
  
-
   
-
   
(285
)
Embedded derivative - convertible debentures due 2042
 
$
(176
)
  
-
   
-
   
(176
)
  
$
(854
)
 
$
-
  
$
-
  
$
(854
)
                 
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
)