EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) pension_plan	Mar. 31, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Number of qualified defined benefit plans | pension_plan	1
Weighted-average expected long-term rate of return on plan assets	7.20%
Pension
Defined Benefit Plan Disclosure [Line Items]
Pension contributions paid	$ 500
Minimum annual pension contribution	2,900
Service cost	0	$ 0
Interest cost	751	815
Expected return on plan assets	(982)	(945)
Amortization of losses	159	116
Net periodic benefit (credit) cost	(72)	(14)
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	12	13
Expected return on plan assets	0	0
Amortization of losses	1	0
Net periodic benefit (credit) cost	$ 15	$ 15