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EMPLOYEE BENEFIT PLAN (Tables)
 3 Months Ended
Mar. 31, 2016
EMPLOYEE BENEFIT PLAN [Abstract]  
Components of net periodic benefit cost
Net periodic benefit costs for such retirement medical plan were as follows:
 
  
Three Months Ended
March 31,
 
  
2016
  
2015
 
Service cost
 
$
10
  
$
13
 
Interest cost
  
9
   
9
 
Amortization of prior service credit
  
(2
)
  
(5
)
Amortization of gain
  
(3
)
  
-
 
Net periodic benefit cost
 
$
14
  
$
17