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EMPLOYEE BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
Net periodic benefit costs for such retirement medical plans were as follows:
 Three Months Ended
March 31,
 20202019
Service cost$17  $16  
Interest cost 10  
Amortization of prior service cost19  18  
Amortization of gain(13) (11) 
Net periodic benefit cost$29  $33