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STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Unrecognized Net Periodic Benefit Credit (Costs)    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax $ (9,725) $ (15,800)
Tax benefit 1,481 4,067
Total, net of tax (8,244) (11,733)
Unrecognized Net Periodic Benefit Credit (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 (1,253) (2,968)
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 33 93
Pension settlement expense, including termination expense    
Significant reclassifications out of accumulated other comprehensive loss by component    
Total, pre-tax (8,505) $ (12,925)
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