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EMPLOYEE BENEFIT PLAN (Tables)
9 Months Ended
Sep. 30, 2017
EMPLOYEE BENEFIT PLAN [Abstract]  
Components of Net Periodic Benefit Cost
Net periodic benefit costs for such retirement medical plans were as follows:

  
Nine Months Ended
September 30,
 
  
2017
  
2016
 
Service cost
 
$
50
  
$
48
 
Interest cost
  
35
   
33
 
Amortization of prior service cost
  
55
   
40
 
Amortization of gain
  
(11
)
  
(8
)
Net periodic benefit cost
 
$
129
  
$
113