EMPLOYEE BENEFIT PLANS - Components of Other Changes in Assets and Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
EMPLOYEE BENEFIT PLANS
Net loss	$ 571	$ 902	$ 2,606
Net loss amortization	(437)	(377)	(137)
Total recognized in other comprehensive income	134	525	2,469
Total recognized in net periodic pension cost (income) and other comprehensive (income) loss	132	$ 345	$ 2,055
Estimated net actuarial loss that will be amortized from accumulated other comprehensive income into net periodic pension cost	$ 441