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EMPLOYEE BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
Net periodic benefit costs for such retirement medical plans were as follows:
 Nine Months Ended
September 30,
 20202019
Service cost$51 $47 
Interest cost19 29 
Amortization of prior service cost56 55 
Amortization of gain(38)(34)
Net periodic benefit cost$88 $97