STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Unrecognized Net Periodic Benefit Costs
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ (9,115)	$ (3,685)
Tax benefit	1,324	949
Total, net of tax	(7,791)	(2,736)
Unrecognized Net Periodic Benefit Costs | Nonunion Defined Benefit Pension Plan
Significant reclassifications out of accumulated other comprehensive loss by component
Total, net of tax	(7,300)
Amortization of net actuarial loss
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	(1,005)	(2,152)
Amortization of net actuarial loss | Nonunion Defined Benefit Pension Plan
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	(300)
Amortization of prior service credit
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	25	70
Pension settlement expense, including termination expense
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	(8,135)	$ (1,603)
Pension settlement expense, including termination expense | Nonunion Defined Benefit Pension Plan
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	(8,100)
Pension termination expense | Nonunion Defined Benefit Pension Plan
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	(4,000)
Tax benefit	$ 0