PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Nonunion) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension and other postretirement benefit plans
Pension settlement expense, pre-tax	$ (89)	$ (1,356)
Pension settlement expense, net of tax	66	1,007
Nonunion Defined Benefit Pension Plan
Pension and other postretirement benefit plans
Pension settlement expense, pre-tax		(1,356)
Pension settlement expense, net of tax		1,000
Lump-sum distributions		$ 14,900
Supplemental Benefit Plan
Pension and other postretirement benefit plans
Benefit	700
Pension settlement expense, pre-tax	(89)
Pension settlement expense, net of tax	$ 100