EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
EMPLOYEE BENEFIT PLANS
Interest cost	$ 469	$ 442	$ 464
Expected return on plan assets	(967)	(1,052)	(1,059)
Service costs	59	53	44
Net loss amortization	437	377	137
Net periodic pension benefit	$ (2)	$ (180)	$ (414)