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EMPLOYEE BENEFIT PLANS Table 3 - Adjustments to Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Income tax (expense) benefit $ 28 $ 14 $ (94)
Total changes in other comprehensive income (loss) (4,144) (1,314) 2,334
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (2,159) 2,545 1,049
Amortization of prior service credit (2,057) (2,057) (2,057)
Amortization of net actuarial loss 1,845 846 2,174
Net (gain) loss reclassified into income (212) (1,211) 117
Reclassification of stranded tax effects 0 0 (74)
Income tax (expense) benefit 28 14 (69)
Total changes in other comprehensive income (loss) (2,343) 1,348 1,023
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (793) (1,559) 2,267
Amortization of prior service credit (1,145) (1,145) (1,145)
Amortization of net actuarial loss 137 42 214
Net (gain) loss reclassified into income (1,008) (1,103) (931)
Reclassification of stranded tax effects 0 0 0
Income tax (expense) benefit 0 0 (25)
Total changes in other comprehensive income (loss) $ (1,801) $ (2,662) $ 1,311