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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2018
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
 
March 31, 2018
            
Assets:
            
Assets held in rabbi trusts
 
$
43,756
  
$
27,199
  
$
16,557
  
$
-
 
Available for sale securities
 
$
4,702
   
4,702
   
-
   
-
 
  
$
48,458
  
$
31,901
  
$
16,557
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(300
)
 
$
-
  
$
-
  
$
(300
)
Embedded derivative - convertible debentures due 2041
 
$
(270
)
  
-
   
-
   
(270
)
Embedded derivative - convertible debentures due 2042
 
$
(129
)
  
-
   
-
   
(129
)
  
$
(699
)
 
$
-
  
$
-
  
$
(699
)
December 31, 2017
                
Assets:
                
Assets held in rabbi trusts
 
$
45,252
  
$
28,589
   
16,663
  
$
-
 
Available for sale securities
 
$
4,621
   
4,621
   
-
   
-
 
  
$
49,873
  
$
33,210
  
$
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
)