EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) pension_plan	Sep. 30, 2018 USD ($)
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			$ 900
Minimum annual pension contribution	$ 1,300		1,300
Discretionary pension contributions paid			5,000
Service cost	0	$ 0	0	$ 0
Interest cost	799	755	2,398	2,266
Expected return on plan assets	(777)	(983)	(2,330)	(2,950)
Amortization of losses	112	168	337	505
Net periodic benefit cost (credit)	134	(60)	405	(179)
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	4	5
Interest cost	13	13	40	38
Expected return on plan assets	0	0	0	0
Amortization of losses	0	0	0	2
Net periodic benefit cost (credit)	$ 14	$ 15	$ 44	$ 45