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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
Net periodic benefit costs for such retirement medical plans were as follows:
 
 
Six Months Ended
June 30,
 
 
2019
 
2018
Service cost
 
$
32

 
$
39

Interest cost
 
20

 
22

Amortization of prior service cost
 
36

 
35

Amortization of gain
 
(22
)
 
(2
)
Net periodic benefit cost
 
$
66

 
$
94