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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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:

  
Total
Fair Value
  
Level 1
  
Level 2
  
Level 3
 
September 30, 2017
            
Assets:
            
Assets held in rabbi trusts
 
$
44,262
  
$
28,240
  
$
16,022
  
$
-
 
Available for sale securities
 
$
4,511
   
4,511
   
-
   
-
 
  
$
48,773
  
$
32,751
  
$
16,022
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(296
)
 
$
-
  
$
-
  
$
(296
)
Embedded derivative - convertible debentures due 2041
 
$
(272
)
  
-
   
-
   
(272
)
Embedded derivative - convertible debentures due 2042
 
$
(163
)
  
-
   
-
   
(163
)
  
$
(731
)
 
$
-
  
$
-
  
$
(731
)
December 31, 2016
                
Assets:
                
Assets held in rabbi trusts
 
$
41,917
  
$
27,297
   
14,620
  
$
-
 
Available for sale securities
 
$
3,969
   
3,969
   
-
   
-
 
  
$
45,886
  
$
31,266
  
$
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
)