EMPLOYEE BENEFIT PLANS - Schedule of Net Pension Cost (Credit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 90	$ 79
Interest cost	2,438	2,504
Expected return on plan assets	(3,110)	(2,577)
Amortization of net actuarial loss	71	0
Net periodic pension cost (credit)	$ (511)	$ 6