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EMPLOYEE BENEFIT PLANS Table 3 - Adjustments to Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Income tax (expense) benefit $ 14 $ (94) $ 184
Total changes in other comprehensive income (loss) (1,314) 2,334 (6,170)
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain 2,545 1,049 (4,235)
Amortization of prior service credit (2,057) (2,057) (2,059)
Amortization of net actuarial loss 846 2,174 1,484
Net (gain) loss reclassified into income (1,211) 117 (575)
Reclassification of stranded tax effects 0 (74) 0
Income tax (expense) benefit 14 (69) 162
Total changes in other comprehensive income (loss) 1,348 1,023 (4,648)
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (1,559) 2,267 (590)
Amortization of prior service credit (1,145) (1,145) (1,145)
Amortization of net actuarial loss 42 214 191
Net (gain) loss reclassified into income (1,103) (931) (954)
Reclassification of stranded tax effects 0 0 0
Income tax (expense) benefit 0 (25) 22
Total changes in other comprehensive income (loss) $ (2,662) $ 1,311 $ (1,522)