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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
            
Assets:
            
Assets held in rabbi trusts
 
$
45,252
  
$
28,589
  
$
16,663
  
$
-
 
Available for sale securities
 
$
4,621
   
4,621
   
-
   
-
 
Non - U.S. Defined Benefit Pension Plan Assets:
                
Equity securities
 
$
8,793
   
8,793
   
-
   
-
 
Fixed income securities
 
$
12,793
   
12,793
   
-
   
-
 
Cash
 
$
49,019
   
49,019
   
-
   
-
 
  
$
120,478
  
$
103,815
  
$
16,663
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(206
)
  
-
   
-
   
(206
)
Embedded derivative - convertible debentures due 2041
 
$
(214
)
  
-
   
-
   
(214
)
Embedded derivative - convertible debentures due 2042
 
$
(118
)
  
-
   
-
   
(118
)
  
$
(538
)
 
$
-
  
$
-
  
$
(538
)
                 
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
)