EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Employer match amount	$ 0.44
Employee contribution amount	$ 1.00
Maximum percentage of employee salary eligible for employer match (percent)	6.00%
401(k) expense recognized	$ 12,900,000	$ 10,500,000	$ 9,000,000.0