EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employer match amount	$ 0.44	$ 0.44	$ 0.375
Employee contribution amount	$ 1.00	$ 1.00	$ 1.00
Maximum percentage of employee salary eligible for employer match (percent)	6.00%	6.00%	6.00%
401(k) expense recognized	$ 9,000,000	$ 8,800,000	$ 6,900,000