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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Measurements [Abstract]  
Fair Value of Assets and Liabilities Carried at Fair Value 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
  
                         
December 31, 2019
                        
Assets:
                        
Assets held in rabbi trusts
  
$
52,148
    
$
34,280
    
$
17,868
    
$
-
  
Available for sale securities
  
$
4,405
      
4,405
      
-
      
-
  
Non - U.S. Defined Benefit Pension Plan Assets:
                                
Equity securities
  
$
10,534
      
10,534
      
-
      
-
  
Fixed income securities
  
$
16,381
      
16,381
      
-
      
-
  
Cash
  
$
46,714
      
46,714
      
-
      
-
  
   
$
130,182
    
$
112,314
    
$
17,868
    
$
-
  
                                 
December 31, 2018
                                
Assets:
                                
Assets held in rabbi trusts
  
$
41,770
    
$
26,278
    
$
15,492
    
$
-
  
Available for sale securities
  
$
4,309
      
4,309
      
-
      
-
  
Non - U.S. Defined Benefit Pension Plan Assets:
                                
Equity securities
  
$
9,344
      
9,344
      
-
      
-
  
Fixed income securities
  
$
13,572
      
13,572
      
-
      
-
  
Cash
  
$
47,904
      
47,904
      
-
      
-
  
   
$
116,899
    
$
101,407
    
$
15,492
    
$
-
  
Liabilities:
                                
Embedded derivative - convertible debentures due 2040
  
$
(1
)
    
-
      
-
      
(1
)
Embedded derivative - convertible debentures due 2041
  
$
(67
)
    
-
      
-
      
(67
)
Embedded derivative - convertible debentures due 2042
  
$
(2
)
    
-
      
-
      
(2
)
 
  
$
(70
)
  
$
-
    
$
-
    
$
(70
)