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EMPLOYEE BENEFIT PLANS (Funded status) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nonunion Defined Benefit Pension Plan        
Change in benefit obligations        
Benefit obligations at beginning of period   $ 137,417 $ 152,006  
Interest cost   4,269 4,514 $ 4,572
Actuarial (gain) loss   (3,685) 6,448  
Benefits paid   (105,522) (26,491)  
Settlement loss   894 940  
Benefit obligations at end of period   33,373 137,417 152,006
Change in plan assets        
Fair value of plan assets at beginning of period   124,831 144,805  
Actual return on plan assets   1,837 6,517  
Employer contributions $ 5,500 5,500    
Benefits paid   (105,522) (26,491)  
Fair value of plan assets at end of period   26,646 124,831 144,805
Funded status at period end   (6,727) (12,586)  
Accumulated benefit obligation   33,373 137,417  
Supplemental Benefit Plan        
Change in benefit obligations        
Benefit obligations at beginning of period   3,897 4,794  
Interest cost   108 102 130
Actuarial (gain) loss   (57) (10)  
Benefits paid     (989)  
Benefit obligations at end of period   3,948 3,897 4,794
Change in plan assets        
Employer contributions     989  
Benefits paid     (989)  
Funded status at period end   (3,948) (3,897)  
Accumulated benefit obligation   3,948 3,897  
Postretirement Health Benefit Plan        
Change in benefit obligations        
Benefit obligations at beginning of period   24,097 25,532  
Service cost   366 489 429
Interest cost   837 1,060 1,017
Actuarial (gain) loss   4,957 (2,251)  
Benefits paid   (769) (733)  
Benefit obligations at end of period   29,488 24,097 $ 25,532
Change in plan assets        
Employer contributions   769 733  
Benefits paid   (769) (733)  
Funded status at period end   (29,488) (24,097)  
Accumulated benefit obligation   $ 29,488 $ 24,097