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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EMPLOYEE BENEFIT PLANS      
Contribution liability $ 6,287 $ 6,194  
Medical benefits expense amount 4,840 3,734 $ 4,387
Profit Sharing Plan      
EMPLOYEE BENEFIT PLANS      
Contribution expense $ 1,118 $ 1,223 $ 1,109
Employees contributions vesting period 6 years