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EMPLOYEE BENEFIT PLANS (Settlement distributions and expense) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Distributions and pension settlement expense          
Pension settlement expense     $ 8,505 $ 12,925 $ 4,156
Noncash charge to pension settlement expense     4,000    
Nonunion Defined Benefit Pension Plan          
Distributions and pension settlement expense          
Pension settlement distributions     33,938 105,279 26,261
Pension settlement expense     $ 4,164 $ 12,925 $ 4,156
Pension settlement expense per diluted share, net of taxes     $ 0.12 $ 0.36 $ 0.10
Lump-sum distributions     $ 18,400   $ 18,700
Nonparticipating annuity contract purchase price $ 14,000 $ 7,600 14,000   7,600
Transfer of remaining obligation to PGBC $ 1,500   1,500    
Noncash charge to pension settlement expense     4,000    
Supplemental Benefit Plan          
Distributions and pension settlement expense          
Pension settlement distributions     937   $ 989
Pension settlement expense     $ 370    
Pension settlement expense per diluted share, net of taxes     $ 0.01    
Period of delay for pension settlement distribution to key employees         6 months