EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) pension_plan	Jun. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of qualified defined benefit plans | pension_plan			1
Pension contributions paid	$ 0		$ 0
Weighted-average expected long-term rate of return on plan assets			5.70%
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	$ 0	$ 0
Interest cost	557	677	1,114	1,353
Expected return on plan assets	(936)	(876)	(1,873)	(1,752)
Amortization of losses	288	215	577	431
Net periodic benefit (credit) cost	(91)	16	(182)	32
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	4	3
Interest cost	11	13	23	26
Expected return on plan assets	0	0	0	0
Amortization of losses	5	2	10	4
Net periodic benefit (credit) cost	$ 18	$ 17	$ 37	$ 33