EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
EMPLOYEE BENEFIT PLANS
Period of completion of services for qualification of defined contribution plan	90 days	90 days	90 days
Defined contribution plan, percentage of employer matching contribution	50.00%	50.00%	50.00%
Defined contribution plan, percentage of participant contributions	5.00%	5.00%	5.00%
Employee contributions vesting period	5 years	5 years	5 years
Defined contribution plan, employer contribution	$ 1,021	$ 1,030	$ 917