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EMPLOYEE BENEFIT PLANS Table 3 - Adjustments to Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Income tax (expense) benefit $ 184 $ 60 $ 0
Total changes in other comprehensive income (loss) (6,170) (2,850) 0
Pension Plans (The Pension Plan, Excess Pension Plan and SERP) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (4,235) (7,544) 1,000
Amortization of prior service credit (2,059) (2,063) (2,063)
Amortization of net actuarial loss 1,484 1,091 1,845
Net (gain) loss reclassified into income (575) (972) (218)
Income tax (expense) benefit 162 57 (362)
Total changes in other comprehensive income (loss) (4,648) (8,459) 420
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (590) (368) 1,056
Amortization of prior service credit (1,145) (1,145) (1,145)
Amortization of net actuarial loss 191 181 269
Net (gain) loss reclassified into income (954) (964) (876)
Income tax (expense) benefit 22 3 (382)
Total changes in other comprehensive income (loss) $ (1,522) $ (1,329) $ (202)