COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of net periodic benefit cost:
Interest cost	$ 1,054	$ 1,216	$ 2,108	$ 2,432
Expected return on plan assets	(1,491)	(1,234)	(2,983)	(2,466)
Amortization of prior service cost	47	46	93	93
Amortization of net loss	1,063	982	2,127	1,961
Net periodic benefit cost	$ 673	$ 1,010	1,345	$ 2,020
2019 plan year
Components of net periodic benefit cost:
Employer contribution			$ 1,100