EMPLOYEE BENEFIT PLANS - Components of Net Period Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service cost	$ 76	$ 83
Interest cost	2	2
Amortization of transition obligation	4	4
Prior service cost	(42)	(43)
Total pension expense	$ 40	$ 46