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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2020
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,
 20202019
Service cost$34  $32  
Interest cost13  20  
Amortization of prior service cost38  36  
Amortization of gain(26) (22) 
Net periodic benefit cost$59  $66