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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2021
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,
 20212020
Service cost$43 $34 
Interest cost12 13 
Amortization of prior service cost37 38 
Amortization of gain(12)(26)
Net periodic benefit cost$80 $59 

Net periodic benefit costs for such benefit pensions plans were as follows:
Six Months Ended
June 30,
 20212020
Service cost with interest to end of year$35 $52 
Interest cost10 
Expected return on plan assets(18)(8)
Amortization of gain— 
Total net periodic benefit cost$26 $54