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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Nonunion) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension and other postretirement benefit plans      
Pension settlement expense   $ 89 $ 8,135
Pension settlement expense, net of tax $ 5,850 66 7,063
Nonunion Defined Benefit Pension Plan      
Pension and other postretirement benefit plans      
Pension settlement expense 2,530   4,164
Pension settlement expense, net of tax 1,900   3,100
Lump-sum distributions 16,000   33,900
Noncash charge to pension settlement expense 4,000   4,000
Noncash charge to pension settlement expense, Tax $ 0   $ 0
Supplemental Benefit Plan      
Pension and other postretirement benefit plans      
Benefit   700  
Pension settlement expense   89  
Pension settlement expense, net of tax   $ 100