EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) pension_plan	Mar. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of qualified defined benefit plans | pension_plan	1
Weighted-average expected long-term rate of return on plan assets	5.70%
Pension
Defined Benefit Plan Disclosure [Line Items]
Pension contributions paid	$ 0
Minimum annual pension contribution	1,300
Service cost	0	$ 0
Interest cost	800	751
Expected return on plan assets	(777)	(982)
Amortization of losses	112	159
Net periodic benefit (credit) cost	135	(72)
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2
Interest cost	14	12
Expected return on plan assets	0	0
Amortization of losses	0	1
Net periodic benefit (credit) cost	$ 15	$ 15