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EMPLOYEE BENEFIT PLANS (Included in AOCI) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Nonunion Defined Benefit Pension Plan    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost    
Unrecognized net actuarial loss $ 22,588 $ 23,294
Total 22,588 23,294
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year    
Unrecognized net actuarial loss 2,881  
Total 2,881  
Supplemental Benefit Plan    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost    
Unrecognized net actuarial loss 543 635
Total 543 635
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year    
Unrecognized net actuarial loss 80  
Total 80  
Postretirement Health Benefit Plan    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost    
Unrecognized net actuarial loss 2,764 5,708
Unrecognized prior service credit (127) (317)
Total 2,637 $ 5,391
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year    
Unrecognized net actuarial loss 274  
Unrecognized prior service credit (93)  
Total $ 181