EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Employer matching contribution, percent	3.00%	3.00%	3.00%
Contributions by employer	$ 4.1	$ 3.9	$ 3.5
Cost recognized	$ 4.8	$ 4.8	$ 4.0