COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Components of net periodic benefit cost:
Interest cost	$ 1,054	$ 1,216
Expected return on plan assets	(1,492)	(1,232)
Amortization of prior service cost	46	47
Amortization of net loss	1,064	979
Net periodic benefit cost	672	$ 1,010
2018 plan year
Components of net periodic benefit cost:
Employer contribution	$ 1,100