EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) pension_plan	Jun. 30, 2018 USD ($)
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			$ 400
Minimum annual pension contribution	$ 1,300		1,300
Service cost	0	$ 0	0	$ 0
Interest cost	799	759	1,599	1,510
Expected return on plan assets	(777)	(984)	(1,554)	(1,968)
Amortization of losses	112	178	224	338
Net periodic benefit cost (credit)	134	(47)	269	(120)
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	3	3
Interest cost	13	13	27	25
Expected return on plan assets	0	0	0	0
Amortization of losses	0	0	0	1
Net periodic benefit cost (credit)	$ 14	$ 15	$ 30	$ 29