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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Defined contribution plan, age of eligibility	21 years
Defined contribution plan, required service period prior to plan participation	60 days
Defined contribution plan, employer matching contribution (as a percent)	50.00%
Defined contribution plan, maximum annual contribution per employee (as a percent)	2.50%
Defined contribution plan, employer discretionary contribution amount	$ 1,003	$ 1,034	$ 987