EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) pension_plan	Sep. 30, 2017 USD ($)
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			$ 2,300
Minimum annual pension contribution	$ 2,700		2,700
Service cost	0	$ 0	0	$ 0
Interest cost	755	815	2,266	2,444
Expected return on plan assets	(983)	(945)	(2,950)	(2,836)
Amortization of losses	168	116	505	349
Net periodic benefit (credit) cost	(60)	(14)	(179)	(43)
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	5	5
Interest cost	13	13	38	39
Expected return on plan assets	0	0	0	0
Amortization of losses	0	0	2	0
Net periodic benefit (credit) cost	$ 15	$ 15	$ 45	$ 44